Central line dressing change: a step-by-step nursing guide

Changing a central line dressing is one of the highest-stakes sterile procedures a nurse performs at the bedside. A dressing that is done correctly — with full sterile technique, correct CHG antisepsis, and a secure, air-pocket-free transparent film — forms a physical barrier between the catheter insertion site and the microbial environment of a hospital room. A dressing done poorly — rushed, with contaminated gloves, or applied over a wet site — can contribute to a catheter-related bloodstream infection (CLABSI), an event that carries a mortality rate estimated at 12–25% in critically ill patients.

This guide covers the complete central line dressing change procedure for nursing students: supplies, step-by-step sterile technique, site assessment criteria, dressing selection decisions, securement device options, INS-standard change frequencies, complication flags, and NCLEX high-yield points.

For central venous catheter types, insertion, and hemodynamic monitoring, see the central line nursing overview. For PICC-specific maintenance including flushing, blood draws, and daily PICC care, see PICC line care.

When the dressing is due

The Infusion Nursing Society (INS) Standards of Practice and CDC guidelines specify the following change frequencies:

• Transparent semipermeable membrane (TSM) dressing: every 7 days, or immediately when wet, soiled, loose, or no longer fully adhering
• Gauze-based dressing: every 48 hours, or immediately when wet, soiled, or loose
• CHG-impregnated disc (Biopatch): replaced at every dressing change regardless of dressing type

The 7-day interval is a maximum, not a target. A transparent dressing that begins lifting at one corner on day 4 is not a day-7 dressing — it needs changing today. Any break in dressing integrity restores the exposure pathway from skin flora to the catheter insertion site.

Supplies

Gather all supplies before entering the patient’s room. Opening packaging at the bedside while gloved wastes time and increases the risk of contaminating your sterile field.

Standard central line dressing kit includes:

• Sterile gloves (correct size)
• Non-sterile gloves (for initial removal)
• Face mask — for the nurse and ideally for the patient
• CHG/isopropyl alcohol (2% CHG in 70% IPA) swabs or applicator
• CHG-impregnated disc (Biopatch or equivalent)
• Transparent semipermeable membrane dressing (e.g., Tegaderm, IV3000) — or sterile gauze and tape if clinically indicated
• Catheter stabilization device (StatLock or equivalent — check whether replacement is due)
• Date/time label
• Sterile gauze squares (2×2 or 4×4)
• Sterile drape (included in most kits)

Step-by-step procedure

Preparation (before gloves)

1. Perform hand hygiene using soap and water or alcohol-based hand rub. This is the first action — not the second or third.
2. Explain the procedure to the patient. Ask the patient to turn their face away from the insertion site (or apply a mask to the patient) to reduce droplet contamination of the sterile field during the dressing change. Instruct the patient not to reach toward the site.
3. Don a face mask. The nurse must wear a mask throughout the procedure. Respiratory droplets from speech or a cough at close range can contaminate a sterile field within seconds.
4. Position the patient to provide clear access to the insertion site. For internal jugular (IJ) or subclavian CVCs, the patient is typically supine with the head turned away from the insertion site. For femoral lines, the patient is supine.
5. Open the dressing kit using sterile technique. Peel the outer packaging without reaching over the inner sterile contents. Create a sterile field on a clean, dry surface adjacent to the patient.

Dressing removal (non-sterile gloves)

6. Don non-sterile gloves. Remove the old dressing by peeling the edges toward the insertion site — not away from it. Pulling the dressing away from the site exerts outward traction on the catheter and can partially dislodge it. Stabilize the external catheter or hub with your non-dominant hand throughout removal.
7. Remove the CHG disc (if present) and dispose. Note any exudate on the disc or under the dressing.

Site assessment (before sterile gloves)

8. With non-sterile gloves still on, inspect the site. Assess for:
   • Erythema (redness extending beyond the expected post-insertion bruise)
   • Swelling or induration at or around the insertion point
   • Drainage — note character (serous, serosanguineous, purulent) and volume
   • Skin breakdown or maceration under the dressing
   • Tenderness on light palpation over the insertion site
9. Measure and document the external catheter length (the length of catheter visible outside the skin, from the insertion point to the hub). Compare to the baseline length documented at insertion or the last dressing change. Any change from baseline must be reported to the provider before proceeding. A catheter that has migrated inward may have an incorrectly positioned tip; a catheter that has migrated outward may have a tip no longer in the SVC.
10. Remove non-sterile gloves and perform hand hygiene.

Antisepsis and dressing application (sterile gloves)

11. Don sterile gloves. From this point, sterile technique applies. Do not touch any non-sterile surface — including the bed rail, the patient’s skin outside the prepared field, or your own face mask — without changing gloves.
12. Cleanse the insertion site with CHG/IPA. Using the CHG applicator or swab, scrub the skin using a back-and-forth friction motion for 30 seconds. Work from the insertion point outward in a widening area — do not return to the center after moving outward.
13. Allow to dry completely. CHG requires 30 to 60 seconds of full drying time to form its antimicrobial film. Applying a dressing over wet CHG eliminates the sustained bactericidal benefit. This drying step is not optional and must not be rushed.
14. Apply the CHG-impregnated disc directly over the insertion site, CHG side facing the skin. Center the disc over the puncture site so the antimicrobial gel maintains direct contact with the skin immediately surrounding the catheter entry point.
15. Apply the transparent dressing using a no-tension technique:
    • Begin at the center (over the disc and insertion site) and smooth outward to the edges
    • Eliminate all air pockets — air pockets trap moisture and create microenvironments that accelerate bacterial growth
    • Ensure all edges adhere completely — no lifted corners, no wrinkles breaking the seal
    • Frame the edge with the included border strips if present in the kit
16. Secure the catheter with a catheter stabilization device (see securement options below). Place the device under the transparent dressing or at the dressing border per manufacturer instructions. Never secure the catheter body with tape alone — tape does not prevent the in-and-out catheter movement that damages the vessel wall and increases infection risk.
17. Label the dressing with the date, time of change, and your initials or employee ID.
18. Perform hand hygiene. Document (see documentation section below).

Site assessment criteria

Every dressing change is a mandatory site assessment. Use the criteria below to classify findings and determine your response.

Complication flags requiring provider notification

Notify the physician or provider immediately for any of the following:

• Purulent drainage at the insertion site — this is CLABSI until culture proves otherwise
• Fever (temperature above 38°C/100.4°F) with any local site finding (erythema, swelling, tenderness)
• External catheter length changed more than 2 cm from baseline
• Catheter dislodgement — catheter no longer sits at the original insertion depth, or catheter has pulled partially or completely out
• Skin integrity compromise so severe that dressing cannot be secured (involves wound care and provider collaboration)

Dressing selection: transparent vs gauze

The default dressing for all central lines is the transparent semipermeable membrane (TSM). Gauze is used only when clinical conditions prevent TSM from functioning correctly.

When gauze is used, it must be changed every 48 hours at minimum, not every 7 days. Gauze absorbs moisture, wicks organisms, and becomes saturated — leaving a gauze dressing in place for 7 days is a serious practice error.

Transition from gauze to TSM as soon as the site condition allows.

Securement device options

Catheter securement prevents migration, accidental dislodgement, and the repetitive in-and-out catheter movement that damages vessel endothelium and increases infection risk.

StatLock (adhesive stabilization device) The current INS standard-of-care preference for most central lines. StatLock uses a skin-adhesive pad with a catheter-hub clip that cradles the hub securely without sutures or tape. It is applied under or adjacent to the transparent dressing and replaced at each dressing change.

Sutures Sutures placed at insertion were the historical standard. They remain in use for some non-tunneled CVCs in procedural settings. Sutures hold the catheter in place but do not provide the comprehensive stabilization of a device like StatLock — the catheter can still move in and out between the suture points. Sutures also create additional wound sites that can become infected.

Tape alone Not acceptable as a primary securement method for a central line. Tape does not prevent catheter in-and-out movement, loosens with moisture and time, and does not provide the structural support of a stabilization device.

Frequency summary per INS standards

Documentation requirements

After every dressing change, document the following in the patient’s medical record:

• Date and time of dressing change
• Dressing type applied (TSM or gauze)
• CHG disc applied: yes or no
• External catheter length at time of change, compared to documented baseline
• Insertion site appearance: intact skin or specific findings (erythema, swelling, drainage — describe character and extent)
• Presence or absence of sutures/securement device and their integrity
• Catheter stabilization device replaced: yes or no
• Any provider notification: reason for notification and provider response
• Patient tolerance of procedure

Patient education

Most patients do not know what a central line dressing change involves. Clear education reduces anxiety, improves cooperation during the procedure, and reduces complication risk in patients discharged with lines in place.

What to tell the patient before the procedure:

• The dressing change takes about 10–15 minutes
• You need to hold still — especially when the dressing is being removed and the site is being cleaned
• The cleaning solution may feel cold; the CHG will sting briefly if it contacts mucous membranes or eyes — keep your face turned away from the insertion site
• The patient should not speak or cough toward the site during the procedure — turning the face away or wearing a mask during the change is for the patient’s protection

For patients going home with a central line (tunneled catheter or port):

• Inspect the dressing every day. Call the care team if the dressing is wet, lifted, soiled, or falls off
• Do not get the dressing wet — cover it when showering
• Do not attempt to change the dressing without proper training and the correct supplies
• Know the signs of infection to report: new redness around the site, swelling, discharge, fever above 38°C (100.4°F), chills

NCLEX high-yield points

These are the highest-yield, most commonly tested central line dressing change points on NCLEX.

• Sterile technique throughout. Central line dressing changes are sterile procedures, not clean procedures. The nurse wears sterile gloves for site cleansing and dressing application. Non-sterile gloves are used only for dressing removal.
• Both the nurse and patient wear masks. The nurse wears a mask to prevent respiratory droplet contamination of the sterile field. The patient turns their face away or also wears a mask. On NCLEX, a question asking what the nurse should do before starting the procedure — donning a mask is always part of the correct answer.
• Remove the old dressing toward the insertion site, not away from it. Peeling away from the site applies outward traction to the catheter. This is tested as a discrimination between correct and incorrect technique.
• CHG dry time is 30–60 seconds — do not rush it. CHG applied over a wet site does not form its protective film. On NCLEX, questions about dressing changes that describe applying the dressing immediately after CHG application identify an error in technique.
• TSM every 7 days; gauze every 48 hours. This distinction is directly tested. Leaving a gauze dressing in place for 7 days is a practice error with real infection consequences.
• Change any dressing immediately if compromised. The scheduled interval is a maximum, not an absolute. A wet, loose, or soiled dressing needs changing now — not at the next scheduled date.
• CHG disc goes under the transparent dressing, CHG side against the skin. Placing the disc CHG-side up eliminates direct antimicrobial contact with the skin. This detail appears in procedure-based NCLEX questions.
• Apply the transparent dressing from center outward with no tension. Air pockets under the dressing and lifted edges both break the infection barrier. No-tension application prevents the wrinkling and lifting that creates these gaps.
• Measure and document external catheter length at every dressing change. A change from baseline of more than 2 cm requires provider notification before the PICC or CVC is used again.
• Purulent drainage = notify provider immediately. Purulence at a central line site is a CLABSI indicator until proven otherwise. Obtain blood cultures (one from catheter, one peripheral) before antibiotics.
• Stabilization device, not tape, for catheter securement. StatLock or equivalent. Tape alone does not prevent in-and-out catheter movement and is not acceptable as primary securement.
• Femoral central lines carry the highest CLABSI risk of any CVC insertion site. The dressing change is performed using the same sterile technique regardless of site, but frequency of assessment may increase for femoral lines.

Related skills

Central line dressing changes connect to several adjacent clinical skills:

• Central line nursing overview — CVC types, insertion, hemodynamic monitoring, air embolism management, and removal
• PICC line nursing — placement, tip verification, power-injectable PICCs, and PICC removal
• PICC line care — day-to-day PICC maintenance including the SASH flushing protocol, blood draws, and occlusion troubleshooting
• Infection control and isolation precautions — the complete CLABSI prevention bundle, standard precautions, and sterile field principles
• Blood culture collection nursing — how to draw blood cultures from a central line and a peripheral site when CLABSI is suspected

Clinical sources

• Gorski LA, et al. “Infusion Therapy Standards of Practice, 8th Edition.” Journal of Infusion Nursing. 2021;44(1S):S1–S224. (INS Standards — primary reference for dressing types, change frequencies, and securement device standards)
• Centers for Disease Control and Prevention. Guidelines for the Prevention of Intravascular Catheter-Related Infections. 2011 (updated). Available at: https://www.cdc.gov/infectioncontrol/guidelines/bsi/index.html
• O’Grady NP, et al. “Guidelines for the Prevention of Intravascular Catheter-Related Infections.” Clinical Infectious Diseases. 2011;52(9):e162–e193.
• Hallam C, et al. “Use of chlorhexidine-impregnated dressings to prevent vascular and epidural catheter colonisation and infection.” Journal of Hospital Infection. 2016.
• Timsit JF, et al. “Chlorhexidine-impregnated sponges and less frequent dressing changes for prevention of catheter-related infections in critically ill adults.” JAMA. 2009;301(12):1231–1241.
• APIC (Association for Professionals in Infection Control and Epidemiology). CLABSI Prevention Guide. 2013.
• Moureau NL, et al. “Evidence-based consensus on the insertion of central venous access devices: definition of minimal requirements for training.” British Journal of Anaesthesia. 2013.