How Long to Leave a Dressing On: Which Change Intervals Apply in Canada vs the US?
Two habits drive most dressing problems in clinics and care homes: leaving a dressing on until it fails, and changing it so often that the wound bed never settles. The interval sits between those two errors, and what governs it differs more between Canada and the United States than most supply guides admit.
How long can a dressing stay on before it has to be changed?
The strongest evidence comes from surgery. A network meta-analysis published in 2024 pooled trials on the timing of dressing removal and reached a clear conclusion: late changes significantly increase wound infection risk, a change at 48 hours minimizes it, and changing earlier than 48 hours shows no advantage. Changes beyond roughly four and a half days raised the relative risk.
Chronic wounds follow a different clock. A review of first-line interactive dressings notes that foam dressings can be left in place for about a week when exudate is controlled, because they conform to the wound and absorb exudate rather than needing frequent inspection. An evaluation of a foam dressing used on venous leg ulcers and diabetic foot ulcers recorded a mean wear time of five days, with most changes at day three, four or seven, and about four days where exudate was heavy.
Which dressing type can stay on longest?
| Dressing type | Typical interval | What ends it early |
|---|---|---|
| Transparent film | Up to a week on a dry, closed wound | Fluid under the film, lifted edges |
| Foam, non-bordered | About a week, less with heavy exudate | Strike-through, saturation, maceration risk |
| Hydrocolloid | Three to five days | Leakage, odour, peri-wound maceration |
| Alginate or hydrofiber | One to three days | Saturation; needs a secondary dressing |
| Gauze, plain | Daily, or at every strike-through | Soiling, adhesion, dried exudate |
Intervals are not interchangeable across those rows. A gauze dressing that stops a wound drying out on day one is not doing the same job as a foam managing exudate for a week. Sterile gauze sponges cover the frequent-change end of the shelf, and the wound care collection holds the dressing formats that cover the rest.
What does Ontario require in a long-term care home?
Ontario is one of the few jurisdictions that writes wound care into care home regulation rather than guidance. Regulation 246/22 under the Fixing Long-Term Care Act, 2021 requires every licensee to develop and implement a skin and wound care program covering routine skin care, strategies for comfort, mobility and infection prevention, repositioning to relieve pressure, and treatments and interventions.
The same regulation sets the assessment clock. A resident at risk of altered skin integrity is assessed on admission, on return from hospital and after any absence longer than 24 hours. A resident with a wound, pressure injury or skin tear is assessed with an instrument designed for skin and wound assessment, treated immediately to relieve pain, promote healing and prevent infection, and reassessed at least weekly if clinically indicated. A dependent resident is repositioned every two hours or more often as their condition requires.
That weekly reassessment is the practical answer in Ontario care homes: the dressing interval is set by the wound and the dressing, and the regulation sets the point at which a nurse has to look again. Supplies fall under the same section, which requires the equipment and supplies needed to relieve pressure and treat wounds to be readily available at the home.
How does US practice differ from Canadian practice?
The United States does not regulate a dressing interval. A dressing is cleared or registered as a device, the manufacturer's instructions for use state how long it may stay in place, and the schedule in a hospital or nursing home is a clinical and documentation decision tied to payer requirements. Ontario inverts that: the province writes the program and the reassessment interval into regulation, and the home has to show the record.
| Item | Canada, Ontario as the example | United States |
|---|---|---|
| Who sets the interval | Clinical assessment plus the dressing instructions, inside a regulated program | Clinical assessment and dressing instructions, inside a care plan |
| Regulation touchpoint | Regulation 246/22: wound care program, assessments, weekly reassessment | No federal dressing interval; device instructions and payer documentation |
| Dressing status | Licensed medical device for sale in Canada | FDA cleared or registered device |
| Supply duty | Wound care supplies must be readily available at the home | Facility policy and payer coverage rules |
When should a dressing come off sooner?
An interval is a maximum, not a schedule. A dressing comes off early when exudate strikes through, when the seal lifts and the wound contacts the environment, when odour or new pain appears, when the skin around the wound breaks down, or when the dressing has slipped off the wound bed. Recording the reason for an early change is what turns a log into clinical evidence.
Gloves and fixation belong to the same decision: examination gloves worn for the change and changed between wounds, with the dressing held by transparent medical tape that lets the wound edge be seen without lifting the dressing.
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.
References
- Hwang RJKS, Crook DL, Allan CS, et al. A network meta-analysis of the timing of wound dressing removal. Ann R Coll Surg Engl 2024;107(4):235-241 (checked 26 September 2026)
- Lev-Tov H, Serena T, Sigal F, et al. Bench to Bedside Evaluation of a Non-Bordered Foam Dressing. Int Wound J 2025;22(Suppl 1):e70414 (checked 26 September 2026)
- Weller CD, Team V, Sussman G. First-Line Interactive Wound Dressing Update. Front Pharmacol 2020;11:155 (checked 26 September 2026)
- Ontario Regulation 246/22, Fixing Long-Term Care Act, 2021 - skin and wound care, sections 53 and 55 (checked 26 September 2026)
Related Reading
- Silver Foam Dressings in Home Care: Change Interval Guidance
- Skin Tear Dressings: ISTAP Categories and What Care Homes Stock
- Sacral Pressure Injuries: Offloading and Dressing Choice in LTC
Frequently Asked Questions
How long should a dressing stay on a surgical wound?
A 2024 network meta-analysis found that a dressing change at 48 hours minimized wound infection risk, that waiting past about four and a half days increased it, and that changing earlier than 48 hours showed no advantage.
Can a foam dressing be left on for a week?
Often, yes, depending on exudate. A review of first-line dressings notes foam can stay in place about a week when exudate is controlled. A clinical evaluation recorded a mean wear time of five days, with changes most often at day three, four or seven, and about four days where exudate was heavy.
What does Ontario require for wound care in a long-term care home?
Regulation 246/22 requires a skin and wound care program in every long-term care home. A resident with altered skin integrity must be assessed with a wound-specific instrument, treated without delay, and reassessed at least weekly when clinically indicated.
Does the United States set a dressing interval in law?
No. US practice leans on the dressing's instructions for use, the clinical assessment and payer documentation rather than a regulation naming a number of days, which is why two care settings can land on different numbers for the same wound type.
Last updated: September 2026. CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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