Vital signs by age: normal ranges (neonates to adults)

Normal vital signs change significantly across the lifespan. A heart rate of 140 bpm is perfectly expected in a neonate and a serious tachycardia in an adult. A blood pressure of 90/60 mmHg is concerning in an older adult and within normal limits in a toddler. Applying adult values to children – or failing to account for how aging shifts baselines – is one of the most common clinical errors nursing students make. This reference covers normal ranges for heart rate, respiratory rate, blood pressure, temperature, and oxygen saturation for every major age group, from neonates through older adults, with clinical notes on why the numbers differ and when to escalate.

Quick reference table: normal vital signs by age

Sources: PALS (Pediatric Advanced Life Support) guidelines; AAP clinical practice parameters; ACC/AHA 2017 Hypertension Guideline; Potter & Perry Fundamentals of Nursing, 10th ed.

Normal vital signs by age group: detailed breakdown

Neonates (0–28 days)

Heart rate: 100–160 bpm Respiratory rate: 30–60 breaths/min Systolic blood pressure: 60–90 mmHg Temperature: 97.7–100.4°F (36.5–38.0°C) SpO₂: ≥95% (after 10 minutes of life; lower in first minutes is expected)

The neonate’s cardiovascular system is still adapting from fetal circulation. Cardiac output depends almost entirely on heart rate – neonates cannot meaningfully increase stroke volume the way older hearts can. This is why a neonate’s heart rate is so much faster: it compensates for a small, poorly compliant heart.

Neonatal respiratory rate is similarly elevated because tidal volume is small. The normal range of 30–60 breaths/min can startle students who expect the adult rate of 12–20 – but in a newborn, this is physiologically appropriate. Periodic breathing (brief pauses of up to 10 seconds followed by faster breathing) is normal in neonates and does not require intervention. True apnea – a pause longer than 20 seconds, or any pause accompanied by bradycardia or color change – is not normal and warrants immediate response.

Blood pressure is low by adult standards because vascular resistance is lower in neonates. A systolic of 60–90 mmHg is expected. Blood pressure naturally rises over the first several days of life as fluid status stabilizes and the ductus arteriosus closes.

Temperature should be measured rectally in neonates for most accuracy – axillary readings may be 0.5–1.0°F lower. Hypothermia in a neonate (below 97.7°F/36.5°C) is a serious concern: neonates cannot shiver effectively and lose heat rapidly through their large body-surface-area-to-weight ratio.

Oxygen saturation: In the first 10 minutes after birth, SpO₂ naturally rises as the transition from fetal circulation completes. Target SpO₂ in the delivery room at 1 minute of life is 60–65%, rising to 85–95% by 10 minutes. After the transition period, ≥95% is the target. Persistently low SpO₂ in a neonate may indicate congenital heart disease, respiratory distress syndrome, or infection.

Clinical note: Neonates are obligate nose-breathers. Nasal congestion – from secretions or anatomic narrowing – can cause significant respiratory distress. This is a consideration that does not apply to older children or adults.

Infants (1–12 months)

Heart rate: 100–160 bpm Respiratory rate: 25–50 breaths/min Systolic blood pressure: 70–100 mmHg Temperature: 97.7–100.4°F (36.5–38.0°C) SpO₂: ≥95%

By one month of age, the neonatal transition is complete, but the infant’s cardiovascular and respiratory systems remain immature. Heart rate stays elevated relative to adults – 100–160 bpm is the expected range throughout infancy. Resting heart rates at the lower end of this range (around 100 bpm) are more common in older, larger infants; younger infants often run closer to 130–160 bpm at rest.

Respiratory rate in infants is highly variable. Infants breathe faster when crying, feeding, or mildly agitated. Assess respiratory rate in a sleeping or calm infant for the most accurate baseline. A rate above 60 breaths/min in an infant at rest warrants further evaluation – this is the threshold for tachypnea and may indicate bronchiolitis, pneumonia, or congenital heart disease.

Blood pressure rises steadily through infancy as the vascular system matures and body mass increases. By 12 months, a typical infant’s systolic BP is in the 90–100 mmHg range.

For pediatric medication dosing, always calculate by weight – consult a drug dosage calculator and confirm with your pharmacist. Weight-based dosing applies from infancy through early adolescence.

Clinical note: Fever thresholds in infants require special attention. A rectal temperature ≥100.4°F (38.0°C) in an infant under 3 months is a medical emergency requiring immediate evaluation for sepsis. The same temperature in a healthy 9-month-old may be managed with watchful waiting. Age changes the clinical significance of the same number.

Toddlers (1–3 years)

Heart rate: 90–150 bpm Respiratory rate: 20–40 breaths/min Systolic blood pressure: 80–110 mmHg Temperature: 97.7–100.4°F (36.5–38.0°C) SpO₂: ≥95%

Toddlers begin to approach a more recognizable clinical profile as their cardiovascular and pulmonary systems continue maturing. Heart rates in the 90–150 bpm range are normal, and fear, crying, or activity can push rates well above 150 bpm in a healthy toddler – context matters when interpreting any single number.

Respiratory rates slow considerably from infancy, with 20–40 breaths/min being the expected range. A sleeping toddler at 25 breaths/min is normal; a resting toddler at 55 breaths/min is tachypneic and warrants investigation.

Blood pressure continues its upward trend. The AAP defines hypertension in toddlers and preschoolers as blood pressure above the 95th percentile for age, height, and sex – this is why pediatric BP interpretation requires age-specific tables rather than adult cutoffs. A systolic of 110 mmHg is the top of normal for a toddler; the same reading in a 5-year-old warrants closer monitoring.

Clinical note: Toddlers are notoriously difficult to assess. An accurate respiratory rate in a toddler requires observation for a full 60 seconds – short counts extrapolated from 15 or 30 seconds are less reliable in children due to natural rate variability. Similarly, blood pressure should be measured with an appropriately sized cuff: an adult cuff on a toddler’s arm will give falsely low readings.

Preschool children (3–5 years)

Heart rate: 80–140 bpm Respiratory rate: 20–30 breaths/min Systolic blood pressure: 80–110 mmHg Temperature: 97.7–100.4°F (36.5–38.0°C) SpO₂: ≥95%

Preschoolers show progressively narrowing vital sign ranges as their bodies mature. Heart rates slow from the toddler range, and respiratory rates begin to approach the adult zone. A preschooler at 20 breaths/min is at the low end of normal – this is the same minimum seen in adults and adolescents, reflecting the maturation of central respiratory drive.

Blood pressure norms in this age group overlap significantly with toddlers. Hypertension screening begins to take on greater significance in this age group, as primary (essential) hypertension – once considered an adult disease – is now recognized in children as young as 3–5 years, particularly in those with obesity or a strong family history.

Clinical note: Tympanic temperature measurement is generally reliable in preschool-age children. Axillary temperatures read approximately 0.5°F lower than core temperature. Oral temperatures are possible in cooperative preschoolers but remain less reliable than rectal or tympanic. For a definitive fever assessment in any young child, rectal temperature remains the gold standard – though it is rarely used in older preschoolers due to comfort and cooperation.

School-age children (6–12 years)

Heart rate: 70–120 bpm Respiratory rate: 15–25 breaths/min Systolic blood pressure: 85–120 mmHg Temperature: 97.7–100.4°F (36.5–38.0°C) SpO₂: ≥95%

School-age children are physiologically approaching adult norms in several parameters. Heart rate overlaps substantially with the adult range – a resting rate of 70–80 bpm is entirely normal in a 10-year-old. The cardiac output model shifts: cardiac output is now maintained more by stroke volume than heart rate, similar to adults.

Respiratory rates slow to 15–25 breaths/min, and tidal volume increases as the lungs grow. Lung architecture in school-age children is nearly adult in structure, though total capacity remains smaller.

Blood pressure rises steadily through this age group. A systolic of 85 mmHg in a 6-year-old and 120 mmHg in a 12-year-old can both fall within normal limits, depending on height and sex. Per AAP guidelines, blood pressure should be checked at every well-child visit from age 3 onward, and readings above the 95th percentile for age, height, and sex warrant follow-up.

Clinical note: Athletic school-age children, especially those in endurance sports, may have resting heart rates in the 50–65 bpm range – this is physiologic sinus bradycardia from training adaptation, not a pathologic finding. Always assess in context: a child with a resting HR of 55 bpm who is alert, pink, and comfortable with a strong pulse has normal sinus bradycardia. The same rate in an ill-appearing child demands immediate evaluation.

Adolescents (13–18 years)

Heart rate: 60–100 bpm Respiratory rate: 12–20 breaths/min Systolic blood pressure: 90–130 mmHg Temperature: 97.7–99.5°F (36.5–37.5°C) SpO₂: ≥95%

By adolescence, vital sign ranges are virtually identical to adult norms for heart rate, respiratory rate, and temperature. The key distinction is blood pressure: the upper limit of normal continues to shift during adolescence, and what counts as hypertension in a 13-year-old remains height- and sex-adjusted per pediatric tables rather than the flat adult cutoff.

The ACC/AHA 2017 guideline defines elevated blood pressure in adults as ≥120/80 mmHg and hypertension stage 1 as ≥130/80 mmHg. For adolescents 13 years and older, the AAP aligns with this adult threshold for simplicity: a systolic ≥130 mmHg or diastolic ≥80 mmHg is stage 1 hypertension. A 16-year-old with a consistent systolic of 135 mmHg is hypertensive by these criteria – even though 135 is a number that might go unremarked in an adult clinical setting.

Clinical note: Adolescents – particularly athletic females – are at elevated risk for relative bradycardia. Heart rates in the 45–55 bpm range may represent normal athletic adaptation or may signal a problem (eating disorder-related bradycardia, electrolyte disturbance, heart block). Context is essential: trending vital signs over time, assessing nutritional status, and comparing to prior readings all inform interpretation.

Adults (18–64 years)

Heart rate: 60–100 bpm Respiratory rate: 12–20 breaths/min Systolic blood pressure: <120 mmHg (normal); 120–129 mmHg (elevated); ≥130 mmHg (hypertension stage 1) Temperature: 97.7–99.5°F (36.5–37.5°C) SpO₂: ≥95%

Adult vital sign ranges are the most familiar from nursing education. They represent the baseline that most textbooks and clinical references describe without qualification – and the values against which deviations are most often taught.

Per the ACC/AHA 2017 guideline, the blood pressure categories for adults are:

The 2017 reclassification lowered the hypertension threshold from 140/90 mmHg (JNC 7) to 130/80 mmHg. This is clinically significant: a patient with 132/82 mmHg on a medication reconciliation review is now hypertensive by guideline definition, even if their chart says “WNL” based on older criteria.

Temperature note: The commonly cited “normal” of 98.6°F (37.0°C) is a population mean – individual baseline temperatures vary between 97.0°F and 99.0°F. The fever threshold is ≥100.4°F (38.0°C) for adults, measured orally. Rectal temperatures run approximately 0.5–1.0°F higher; axillary temperatures run 0.5–1.0°F lower.

Clinical note: Resting heart rate is a meaningful health marker in adults. Well-conditioned athletes may have resting rates below 60 bpm (sinus bradycardia from physiologic adaptation). A new onset bradycardia in a non-athlete, or a rate that has dropped significantly from the patient’s own baseline, warrants investigation regardless of whether it falls within “60–100.”

Older adults (65+ years)

Heart rate: 60–100 bpm Respiratory rate: 12–20 breaths/min Systolic blood pressure: <130/<80 mmHg (target per ACC/AHA 2017) Temperature: 97.0–99.5°F (36.1–37.5°C) SpO₂: ≥94%

Older adults present the most nuanced vital sign picture. Numeric ranges remain similar to younger adults in many parameters, but the clinical significance of values within those ranges changes.

Blood pressure: The ACC/AHA 2017 guideline recommends a systolic target of less than 130 mmHg for adults 65 and older when tolerated. However, intensive BP lowering (target <120 mmHg) is associated with increased risk of falls, syncope, and acute kidney injury in frail older adults. Clinical judgment, not guidelines alone, determines the right target for individual patients.

Temperature: Core temperature tends to decrease with age. An older adult’s normal baseline temperature may be closer to 97.0–97.5°F – meaning a temperature of 99.5°F, which would not meet fever criteria in a younger adult, represents a significant rise from baseline in an older patient. Older adults with serious infections may present without fever at all (afebrile sepsis). A “normal” temperature does not rule out infection in this population.

Heart rate: Age-related changes to the sinoatrial node reduce the maximum achievable heart rate. Chronotropic medications (beta-blockers, calcium channel blockers) are common in older adults and further blunt heart rate response. Atrial fibrillation is prevalent, making rhythm interpretation an essential complement to rate measurement.

SpO₂: The lower limit of acceptable SpO₂ for older adults is 94%, compared with 95% for younger populations. This reflects normal age-related decline in pulmonary function – reduced elasticity, decreased diffusing capacity, and increased ventilation-perfusion mismatch. A resting SpO₂ of 94–95% in a healthy 78-year-old may be their norm; the same reading in a 30-year-old with previously normal saturations warrants concern.

Respiratory rate: Respiratory rate is the most underused and undervalued vital sign – in all ages, but especially in older adults. A respiratory rate above 20 breaths/min is a reliable early warning sign of clinical deterioration, often rising hours before blood pressure drops or oxygen saturation falls. Many clinical deterioration scoring systems (NEWS, MEWS) weight respiratory rate heavily for this reason.

Clinical applications: using vital signs to recognize deterioration

Tachycardia and bradycardia thresholds

The significance of heart rate depends on context and baseline. Tachycardia thresholds by age:

• Neonates: HR >160 bpm at rest
• Infants: HR >160 bpm at rest
• Toddlers: HR >150 bpm at rest
• Preschool: HR >140 bpm at rest
• School-age: HR >120 bpm at rest
• Adolescents/Adults: HR >100 bpm at rest

Bradycardia thresholds:

• Neonates/Infants: HR <100 bpm (and <60 bpm requires immediate CPR per NRP guidelines)
• Toddlers/Preschool: HR <80 bpm
• School-age: HR <60 bpm
• Adolescents/Adults: HR <60 bpm (unless known athlete or medication effect)

Respiratory rate as an early warning

Tachypnea – elevated respiratory rate – is consistently the earliest measurable sign of clinical deterioration, preceding other vital sign changes by 6–8 hours in many studies. A respiratory rate of 22–25 in an adult or a rate approaching the upper limit for any pediatric age group should trigger increased monitoring and clinical reassessment, even when other vital signs appear stable.

Pediatric Early Warning Score (PEWS)

PEWS is a validated clinical scoring tool used in pediatric settings to identify children at risk for deterioration. It scores respiratory rate, heart rate, and oxygen saturation against age-adjusted norms – making age-specific vital sign knowledge a practical clinical requirement, not just an academic one. A 4-year-old with a heart rate of 145 bpm and a respiratory rate of 28 breaths/min may be within the upper bounds of normal for their age, or may be showing early distress – and PEWS helps nurses apply age-specific context systematically.

When to escalate

Escalate immediately for:

• Any vital sign outside the normal range for age plus clinical signs of distress (altered consciousness, poor perfusion, increased work of breathing)
• A single vital sign significantly outside the normal range without clear explanation (pain, fever, anxiety)
• Any downward trend across multiple vital signs – compensated shock often presents with heart rate rising before blood pressure falls
• Failure to respond to interventions: an infant given supplemental oxygen whose SpO₂ does not improve requires immediate escalation
• Respiratory rate above 30 in any adult or above 60 in a neonate at rest

Common confusions when applying vital sign ranges

Applying adult values to children

The single most common mistake. A blood pressure of 100/60 mmHg in a 7-year-old is perfectly normal. A blood pressure of 80/50 mmHg in an adult is hypotension. A heart rate of 120 bpm in a toddler is unremarkable. The same rate in a resting adult warrants investigation. When in doubt, reference an age-specific table rather than adult intuition.

Missing hypertension in adolescents

A 17-year-old with a consistent blood pressure of 128/82 mmHg may go unrecognized if nurses apply only adult “normal” thresholds. By ACC/AHA 2017 criteria, this is stage 1 hypertension, warranting lifestyle counseling and follow-up. Adolescent hypertension is underdiagnosed in large part because clinicians expect it to be an adult disease.

Fever threshold confusion: axillary vs. rectal

Fever thresholds vary by measurement site:

• Rectal: ≥100.4°F (38.0°C) – most accurate; gold standard in infants under 3 months
• Oral: ≥100.0°F (37.8°C)
• Axillary: ≥99.0°F (37.2°C) – least accurate; acceptable for screening only
• Tympanic: ≥100.4°F (38.0°C) – acceptable from 6 months onward; unreliable in neonates

An axillary temperature of 99.2°F is technically a fever by the axillary threshold – but this is often documented as “no fever” by students comparing it to the oral or rectal cutoff. Using the wrong threshold for the wrong site understates or overstates fever in a clinically meaningful way.

Treating the normal-looking number in a sick patient

A blood pressure of 90/60 mmHg in an adult is hypotension. In a patient with chronic hypertension whose baseline runs 160/95, a reading of 110/70 mmHg may represent relative hypotension – a 30% drop from baseline – even though the absolute number falls within the population “normal” range. Always compare to the patient’s own documented baseline when interpreting vital signs.

Pain as the 5th vital sign

History and mandate

Pain became formally recognized as the “5th vital sign” in 2001 when The Joint Commission (JCAHO) issued standards requiring that every patient’s pain be assessed and documented alongside the four traditional vital signs at every encounter. The mandate arose from growing evidence that pain was systematically undertreated in hospitals – patients were suffering needlessly, and the clinical culture of the time discouraged active pain reporting. By making pain assessment a routine, required component of vital signs, JCAHO aimed to shift that culture toward proactive pain management.

The standard required nurses to:

• Ask about pain at every assessment, not only when the patient reported it
• Document a pain score alongside temperature, heart rate, respiratory rate, and blood pressure
• Re-assess pain after any intervention
• Treat uncontrolled pain as a clinical finding requiring action

For nearly 15 years, this standard shaped nursing practice, nursing education, and NCLEX content. Pain scales became universal. A pain score of 0–10 was documented on every vital signs flowsheet in the country.

Pain scales

Numeric Rating Scale (NRS): The 0–10 scale is the most widely used pain assessment tool for adults and older children who can self-report. Zero represents no pain; 10 represents the worst imaginable pain. Clinical convention categorizes scores as mild (1–3), moderate (4–6), and severe (7–10). The NRS is fast, validated, and suitable for most clinical settings – but it requires the patient to abstract their pain into a number, which not all patients can do reliably.

Wong-Baker FACES Pain Scale: Developed for pediatric use, this scale presents six faces ranging from a neutral smile (0 – no hurt) through progressively distressed expressions to a crying face (10 – hurts worst). It is appropriate for children as young as 3 years who can point to a face and communicate their experience. The FACES scale is also widely used with cognitively impaired adults and older adults who have difficulty with abstract numeric scales. Both scales are validated tools; neither is universally superior – the right scale is the one the patient can use accurately.

Behavioral pain tools: For neonates, preverbal infants, and non-verbal patients of any age, behavioral pain assessment tools fill the gap left by self-report. The FLACC scale (Face, Legs, Activity, Cry, Consolability) scores each behavioral dimension from 0 to 2, yielding a total score of 0–10. The Neonatal Infant Pain Scale (NIPS) is designed specifically for neonates and preterm infants, assessing facial expression, cry, breathing patterns, arms, legs, and state of arousal.

The 2016 reversal

In 2016, The Joint Commission removed pain as a required element of every vital signs assessment. The reasons were both practical and ethical:

• The opioid epidemic had been accelerating for over a decade, and there was growing evidence that mandatory pain scoring contributed to pressure on clinicians to treat every reported pain with opioids to achieve a score of zero – regardless of whether opioids were appropriate
• A “pain score of zero” became a perverse goal: patients were sometimes over-treated to achieve a documented number rather than a meaningful clinical outcome
• Pain is subjective, context-dependent, and not directly measurable in the way that heart rate or temperature are – treating it as a parallel biometric created clinical distortions
• Critics argued that the 5th vital sign framing had inadvertently contributed to opioid over-prescribing

The 2016 withdrawal did not mean pain assessment is now optional – it means that pain assessment is no longer mandated to accompany every vital signs check as a fifth number on the flowsheet. Pain assessment remains a core nursing competency and a required element of holistic patient assessment. The shift was from reflexive documentation of a number to purposeful, individualized pain evaluation with appropriate clinical response.

Documentation requirements

Regardless of institutional policy, pain documentation must capture:

• The tool used (NRS, FACES, FLACC, etc.) and the score obtained
• The character, location, onset, and quality of the pain (using a structured format such as PQRST or OLDCARTS)
• Interventions taken in response to the pain score
• Re-assessment scores after intervention, with timing documented

Documentation of pain without a re-assessment after intervention is incomplete. If a patient receives an analgesic and their pain score is never reassessed, the clinical record fails to demonstrate whether the intervention worked – which is both a quality failure and a regulatory concern.

Nursing implications by age group

Neonates and preverbal infants: Behavioral assessment is the only option. Neonates in pain exhibit characteristic facial grimacing (brow bulge, nasolabial furrow, eye squeeze), high-pitched cry, limb withdrawal, and physiologic changes including tachycardia and oxygen desaturation. These signs are not specific to pain – they also occur with hunger and procedural distress – but trending them with a validated behavioral tool (NIPS, CRIES, or FLACC) provides a systematic framework.

Toddlers and preschoolers: Self-report is unreliable before age 3–4. Children in this age group often cannot localize pain accurately, may deny pain to avoid further procedures, or may report pain inconsistently. Behavioral observation combined with parental input gives the most complete picture. The FLACC scale applies well through this age range.

School-age children: The FACES scale is appropriate from age 3 onward and is preferred by many school-age children. Children 8 years and older can generally use the NRS reliably. Cultural and developmental factors affect pain expression – a child who appears calm and stoic may have severe pain; a child who cries loudly may be frightened rather than in significant pain.

Adolescents: Self-report with the NRS is standard. Adolescents may underreport pain due to stoicism, fear of judgment, or concern about opioid administration. Create a private, non-judgmental environment for pain assessment, especially in the presence of family members.

Older adults: Pain is underreported and undertreated in older adults. Barriers include stoicism (“I don’t want to be a bother”), cognitive impairment reducing self-report reliability, atypical pain presentations (pain may present as agitation or withdrawal rather than verbal complaint), and clinician assumptions that pain is an inevitable part of aging. In cognitively impaired older adults, use a validated behavioral tool such as the Pain Assessment in Advanced Dementia (PAINAD) scale or the Abbey Pain Scale. A temperature of 99.5°F in an older adult may be a fever; agitation in an older adult with dementia may be pain. Both require investigation, not assumption.

Sources: The Joint Commission pain assessment standards (2001); The Joint Commission Sentinel Event Alert Issue 54 (2017); Wong-Baker FACES Foundation (wonkbakerfaces.org); Merkel SI et al., “The FLACC: a behavioral scale for scoring postoperative pain in young children,” Pediatric Nursing 1997; Potter & Perry Fundamentals of Nursing, 10th ed.

NCLEX tips: vital signs by age

These tips target the most commonly tested vital sign concepts on NCLEX-RN and NCLEX-PN. Each reflects a high-yield pattern that appears across multiple question formats.

• Tachycardia thresholds are age-dependent – memorize the cutoffs. A heart rate of 160 bpm is normal in a neonate and tachycardia in an adult. NCLEX questions frequently test whether you can identify a rate as appropriate or abnormal for the stated age group. Use the ranges in the reference table at the top of this page.

• Fever threshold is measurement-site dependent. Rectal ≥100.4°F (38.0°C), oral ≥100.0°F (37.8°C), axillary ≥99.0°F (37.2°C). NCLEX questions often state a measurement method and temperature and ask you to interpret it – applying the wrong threshold is the error the question is designed to catch.

• A rectal temperature ≥100.4°F in an infant under 3 months is a medical emergency. The correct NCLEX action is to notify the provider immediately – not to administer acetaminophen first, not to recheck in 30 minutes. Age changes the urgency of the same number.

• Neonatal SpO₂ in the first 10 minutes of life is expected to be lower than 95%. Target SpO₂ at 1 minute of life is 60–65%, rising to 85–95% by 10 minutes. If a NCLEX question describes a neonate with SpO₂ of 88% at 5 minutes of life, this is within the expected transition range – supplemental oxygen at that point is not immediately indicated unless other signs of distress are present.

• Older adults can have serious infection without fever. Afebrile presentation of sepsis is common in older adults. A “normal” temperature does not rule out infection. If an NCLEX question describes an older adult with a temperature of 99.2°F plus confusion, dysuria, and flank pain, the correct interpretation is that 99.2°F may represent a significant rise from an older adult’s lower baseline – further evaluation is warranted.

• Older adults have a lower baseline temperature than younger adults. Normal baseline in older adults is approximately 97.0–97.5°F. A temperature that would appear “afebrile” by adult standards may represent a fever in an older patient. NCLEX questions may present a low-grade temperature in an older adult alongside clinical signs and ask what the nurse should do – the answer is to treat it as a potential fever and notify the provider.

• An athletic child or adolescent with a resting HR in the low 50s is not in danger. Physiologic sinus bradycardia from training adaptation is normal. NCLEX questions test whether you distinguish this from pathologic bradycardia. Context clues: alert, pink, comfortable child with a history of athletic training = physiologic. An ill-appearing child with a suddenly low HR = pathologic.

• Neonate vs. infant HR thresholds differ from adult bradycardia criteria. For neonates and infants, bradycardia is HR <100 bpm (not <60). HR <60 bpm in a neonate requires immediate CPR per Neonatal Resuscitation Program (NRP) guidelines. This is a high-stakes NCLEX concept.

• NCLEX tests route-adjusted fever interpretation. An axillary temperature of 99.5°F is a fever by the axillary threshold (≥99.0°F). Many students miss this because 99.5°F “sounds close to normal” when compared against the oral or rectal cutoff. The site of measurement determines the threshold.

• Respiratory rate is the earliest warning sign of clinical deterioration. A respiratory rate above 20 in an adult (or approaching the upper limit of normal for any pediatric age group) is more sensitive than blood pressure or heart rate as an early deterioration signal. NCLEX questions about prioritization often hinge on recognizing elevated respiratory rate as the most urgent finding.

• Blood pressure in toddlers and preschoolers is interpreted against age-specific tables, not adult cutoffs. A systolic of 110 mmHg is at the top of normal for a toddler. The same reading in an adult is within normal limits. If NCLEX presents a 2-year-old with a systolic of 112 mmHg, this warrants follow-up – applying adult thresholds is a classic distractor.

• The 2017 ACC/AHA guideline lowered the adult hypertension threshold from 140/90 to 130/80. NCLEX questions may present a patient with 132/84 mmHg and ask what the nurse should do – the correct answer reflects current guideline criteria, not the older JNC 7 threshold.

• Periodic breathing in neonates is normal; apnea is not. Periodic breathing (brief pauses of up to 10 seconds followed by faster breathing) requires no intervention. True apnea – a pause longer than 20 seconds, or any pause with bradycardia or color change – requires immediate action. NCLEX questions distinguish these two presentations.

• Pain is assessed using a tool matched to the patient’s age and cognitive status. NRS for adults and older children. FACES for children 3 years and older. FLACC for neonates, infants, and non-verbal patients. NCLEX expects you to select the appropriate tool, not just any pain scale.

NCLEX practice scenarios: vital signs by age

Each scenario below is followed by the correct answer and a detailed rationale. These scenarios are representative of the question formats and clinical reasoning tested on NCLEX-RN.

Scenario 1

A nurse is caring for a 2-year-old brought to the emergency department for fever. During assessment, the nurse notes the child’s heart rate is 145 bpm, respiratory rate is 30 breaths/min, and temperature is 101.8°F rectally. The child is crying and clinging to the parent. Which finding requires immediate nursing intervention?

A) Heart rate of 145 bpm B) Respiratory rate of 30 breaths/min C) Rectal temperature of 101.8°F D) No finding requires immediate intervention – all values are within normal limits for a toddler

Correct answer: C

Rationale: A rectal temperature of 101.8°F (38.8°C) exceeds the fever threshold of 100.4°F (38.0°C) and requires provider notification and antipyretic intervention. The heart rate of 145 bpm is within the toddler normal range of 90–150 bpm – and in a crying, febrile child, a rate at the upper end of this range is physiologically expected. A respiratory rate of 30 breaths/min is within the toddler normal range of 20–40 breaths/min. The temperature is the only value that falls outside normal and requires action. Options A and B represent normal values for this age group; option D is incorrect because the fever does require intervention.

Scenario 2

A nurse is assisting with the care of a neonate delivered at 39 weeks gestation. At 3 minutes of life, the pulse oximetry reads 88%. The neonate is pink with good muscle tone and a strong cry. Which action is most appropriate?

A) Apply supplemental oxygen immediately via blow-by B) Prepare for immediate intubation C) Continue to monitor – the reading is within the expected transitional range D) Call a rapid response

Correct answer: C

Rationale: Neonatal SpO₂ naturally rises during the transition from fetal to neonatal circulation. At 3 minutes of life, the target SpO₂ per NRP (Neonatal Resuscitation Program) guidelines is 70–75%. A reading of 88% at 3 minutes is above the expected minimum – this neonate is transitioning well. The neonate’s clinical appearance (pink, good tone, strong cry) supports continued monitoring without intervention. Supplemental oxygen is indicated if the SpO₂ is below the target for the specific minute of life and the neonate shows signs of distress – neither condition applies here. Preparing for intubation (option B) or calling a rapid response (option D) would be significant overreactions to a value that is within expected transitional norms.

Scenario 3

An older adult is admitted from a long-term care facility with a 3-day history of confusion, increased urinary frequency, and foul-smelling urine. Current vital signs: temperature 99.2°F orally, heart rate 88 bpm, blood pressure 118/72 mmHg, respiratory rate 18 breaths/min. The charge nurse asks if this patient has a fever. Which response is correct?

A) “No – 99.2°F is below the oral fever threshold of 100.0°F.” B) “Possibly – older adults have a lower baseline temperature, so 99.2°F may represent a significant rise.” C) “Yes – 99.2°F meets the fever threshold for older adults.” D) “No – older adults do not develop fevers with urinary tract infections.”

Correct answer: B

Rationale: Older adults have a lower baseline core temperature than younger adults – normal baseline is approximately 97.0–97.5°F. A temperature of 99.2°F, while below the standard oral fever threshold of 100.0°F, may represent a rise of 1.5–2.0°F from this patient’s baseline – a clinically meaningful change. In a patient with signs and symptoms consistent with a urinary tract infection (confusion, urinary frequency, foul-smelling urine), a temperature that is elevated relative to the individual’s baseline must be treated as a potential fever, even if it does not meet the textbook cutoff. Option A applies a threshold without accounting for individual baseline. Option C is incorrect – 99.2°F does not meet the standard oral fever threshold. Option D is incorrect – older adults can and do develop fevers with infections, though they are more likely than younger adults to present with afebrile sepsis.

Scenario 4

An infant is brought to the clinic at 4 months of age. The nurse obtains an axillary temperature of 99.5°F. The parent states the infant has been fussy and feeding poorly for one day. How should the nurse interpret this finding?

A) The temperature is normal – 99.5°F is below the fever threshold of 100.4°F B) The temperature indicates a fever by the axillary measurement threshold C) Axillary temperatures are unreliable in infants and this reading cannot be interpreted D) The temperature is normal – axillary readings are always 0.5°F below rectal readings, so the rectal equivalent would be 100.0°F, which is not a fever

Correct answer: B

Rationale: The axillary fever threshold is ≥99.0°F (37.2°C) – lower than the oral threshold (100.0°F) and the rectal threshold (100.4°F). An axillary temperature of 99.5°F meets the axillary fever criterion. The error in option A is comparing an axillary reading to the rectal/oral fever threshold – different measurement sites have different thresholds. Option C is incorrect – axillary measurements are accepted for screening in infants over 1 month, though rectal temperature remains the gold standard in infants under 3 months. Option D performs an incorrect conversion – adding approximately 0.5°F to an axillary reading gives the rectal equivalent, not 0.5°F below. The rectal equivalent of 99.5°F axillary would be approximately 100.0–100.5°F, which approaches or meets the rectal fever threshold. Regardless of the conversion approach, the axillary reading of 99.5°F stands as a fever by its own threshold. Given this infant’s age, a fever warrants provider notification and evaluation.

Scenario 5

A school nurse performs a routine sports physical on a 10-year-old athlete who participates in competitive swimming. The child’s resting heart rate is 55 bpm. The child is alert, in no distress, and has a normal color. The nurse reviews prior records and finds resting heart rates of 54, 56, and 57 bpm over the past two years. Which action is most appropriate?

A) Call 911 – a heart rate of 55 bpm in a child requires emergency evaluation B) Notify the provider immediately – this is bradycardia for the school-age age group C) Document the finding as physiologic sinus bradycardia consistent with athletic training and proceed with the physical D) Withhold sports clearance until an EKG is obtained

Correct answer: C

Rationale: The normal resting heart rate for school-age children (6–12 years) is 70–120 bpm – and 55 bpm falls below this range. However, athletic children, particularly those in endurance sports, regularly develop physiologic sinus bradycardia as a training adaptation. The key contextual factors here are: (1) the child is a competitive swimmer with a known training history; (2) the child is alert, comfortable, and in no distress; (3) the low rate is consistent with prior documented readings spanning two years. This pattern is characteristic of physiologic bradycardia, not a new or concerning finding. Calling 911 (option A) is a disproportionate response to an expected finding in an athlete. Immediate provider notification (option B) would be appropriate if this were a new finding in a non-athlete or if the child appeared unwell. Withholding clearance pending EKG (option D) is not indicated by this clinical picture alone – a resting bradycardia in a well-appearing athlete with a stable rate over years is not a standard EKG indication. Document and proceed.

Related references

Vital signs are one component of a complete clinical assessment. For deeper reference on related topics:

• Head-to-toe assessment: The full systematic physical assessment framework – vital signs are the starting point, and this guide covers every body system that follows.
• APGAR score: The standard tool for evaluating neonatal vital status immediately after delivery, including pulse and respiration scoring.
• Glasgow Coma Scale: The GCS quantifies neurological status – complement vital signs with GCS scoring in any patient with altered consciousness.
• Nursing lab values: Normal lab values by age (CBC, metabolic panel, ABGs) are the laboratory complement to bedside vital sign assessment.

For pediatric patients, weight-based dosing is calculated based on accurate weight in kilograms. Use a drug dosage calculator to verify calculations before administration.