Written and maintained by CASRAI Editorial Board
Last updated
This page describes products and general use; it is not medical advice.
A disinfecting cap is a small cap, pre-filled with 70% isopropyl alcohol, that screws onto the needleless connector of an intravenous line to disinfect it and to cover it between uses. It is handled by nurses, infusion and dialysis staff and the people who stock their supplies. After reading you should be able to tell a cap from an alcohol swab, know what the manufacturer and regulator say about it, and understand how strong the evidence behind it is. The instructions for use (IFU) of the specific product always take precedence.
What a disinfecting cap is
A disinfecting cap is a single-purpose cap that carries a disinfectant and fits a needleless connector, the valve at the end of an IV line. B. Braun describes its SwabCap as “a luer access valve cap with 70% Isopropyl alcohol (IPA) as a disinfectant”, intended for swabbable needleless connectors as a disinfecting cleaner before line access and as a physical barrier to contamination between accesses (B. Braun product page, checked 2026-10-30).
The US Food and Drug Administration lists the category under product code QBP, “Cap, Device Disinfectant”, as a Class 2 device in the General Hospital specialty, with the definition “Disinfect needleless access valves and may act as a physical barrier to contamination if not removed for a set period of time” (openFDA device classification record, checked 2026-10-30; regulation number 880.5440).
How it works
The cap does two jobs. While it sits on the connector, it holds the alcohol against the connector surface for a period of contact time. If it is left in place, it also covers the access surface, so it acts as a physical barrier between uses. A published systematic review describes caps as providing “active mechanical friction along with longer contact time creating a physical and chemical barrier between the lumen and the environment” (Moureau and Flynn, Nursing Research and Practice, 2015).
Contact time and the period a cap may stay on are set by each manufacturer and printed in the product’s IFU. The 2015 review notes that the optimal technique or disinfection time has not been identified.
Types and variants
The 2015 review separates three approaches to disinfecting the needleless connector hub. They differ in how the alcohol is applied and in what the cap does afterwards.
| Approach | Format | Key difference | Source |
|---|---|---|---|
| Manual scrub with 70% alcohol (or alcoholic chlorhexidine, or povidone iodine) | Swab or wipe | Active scrubbing by the user; not a cap | Moureau and Flynn 2015 |
| Single-use cleansing cap | Cap applied to the access site, then discarded | “Designed for use as an access site cleansing cap for single use, then discarded” | Moureau and Flynn 2015 |
| Cap left on the connector (passive protection) | Cap that stays on between line accesses | Adds a physical barrier between accesses | B. Braun product page; Moureau and Flynn 2015 |
The review also uses the term alcohol port protector for caps of this kind and names SwabCap, Curos Port Protector, EffectIV-Cap and DualCap among the products studied.
Labels and handling basics
- The IFU names the connector type the cap is made for. B. Braun states its cap is for swabbable needleless connectors.
- The manufacturer’s IFU, not general guidance, defines contact time and replacement for each product; they are not the same for every product.
- Some caps are designed for single use and are discarded after removal.
For the wider context of lines and connectors, see the CASRAI guides on IV supplies, the female luer lock, central venous catheters and saline flushes. Infusion consumables are also listed in the lac.us infusion supplies category.
What the evidence shows
The access hub is a recognised contamination risk. The 2015 review reports that 33-45% of access hubs (402 of 900) were contaminated in normal patient use, and that compliance with disinfection was as low as 10% in one study.
Studies of passive alcohol caps reported reductions in bloodstream infection rates of 48% to 86%. Examples cited include a fall in central line-associated bloodstream infection (CLABSI) from 1.42 to 0.69 per 1,000 catheter days, and from 2.3 to 0.3. The review’s own conclusion is cautious: the evidence is low-level, there were no high-quality randomized trials against infection outcomes, and the authors say randomized trials are needed to establish the efficacy of caps. The percentages are observational findings, not a guaranteed effect. For the hospital-wide picture, see the CLABSI prevention bundle.
FAQ
What is a disinfecting cap?
A cap containing 70% isopropyl alcohol that fits a needleless connector, disinfects it and can serve as a barrier between accesses (B. Braun; FDA product code QBP).
What is the FDA class of a disinfecting cap?
The openFDA record for product code QBP, “Cap, Device Disinfectant”, lists Class 2 (checked 2026-10-30).
How is a cap different from an alcohol swab?
The 2015 review describes swabbing as manual scrubbing by the user, while a cap holds the disinfectant against the connector and, if left on, covers it as a barrier.
Is there proof that caps reduce infections?
Observational studies reported reductions of 48-86%, but a 2015 systematic review found low-level evidence and called for randomized trials.
Sources
- openFDA, Device Classification, product code QBP, “Cap, Device Disinfectant”: https://api.fda.gov/device/classification.json?search=product_code:QBP, checked 2026-10-30.
- B. Braun, SwabCap product page: https://catalogs.bbraun.com/en-01/p/PRID00008530/swabcap, checked 2026-10-30.
- Moureau NL, Flynn J. Disinfection of Needleless Connector Hubs: Clinical Evidence Systematic Review. Nursing Research and Practice, 2015: https://pmc.ncbi.nlm.nih.gov/articles/PMC4446481/, checked 2026-10-30.
