27/02/2026
⏱️ Rapid Lateral-Flow Carbapenemase Tests
Want to know fast if an Enterobacterales or Pseudomonas isolate carries a major carbapenemase? Lateral-flow immunochromatographic tests (the quick “CARBA” strips) give near-real-time answers — but use them with rules, not faith.
Why labs should care:
Speed wins. These strips identify common carbapenemase families (KPC, NDM, VIM, IMP, OXA-48–like) from a cultured colony in ~15 minutes — perfect for rapid IPC notification and early stewardship conversations.
Low operational overhead. No complex instrument, minimal hands-on training, and easy workflow make them ideal for many clinical labs that need fast triage results.
Clinical impact when tied to action. A positive rapid carbapenemase result should trigger predefined steps (isolate patient, notify IPC, discuss targeted therapy with stewardship) — that’s where outcomes improve, not from the strip itself.
What they do well:
High sensitivity/specificity for the targeted families in most validation studies.
Great for rapid triage of ertapenem- or carbapenem-nonsusceptible isolates so IPC and pharmacy can move before full genotyping/AST finishes.
Important limits you must tell clinicians:
They test for specific carbapenemase families only. A negative strip does not rule out non-targeted enzymes, rare variants, or alternative resistance mechanisms (porin loss + ESBL, etc.).
You still need confirmatory testing. Send the isolate for AST and molecular confirmation (or WGS) — the strip result is provisional and action-triggering, not definitive.
Some products vary by organism and local variants. Validate locally (especially for non-Enterobacterales) and know which gene variants your assay detects.
Quick SOP checklist:
Run lateral-flow carbapenemase test on any carbapenem-nonsusceptible isolate per reflex rule (e.g., ertapenem or meropenem nonsusceptible).
If positive → immediate IPC + ASP notification and freeze isolate for confirmatory testing.
If negative but clinical/epidemiologic risk is high → proceed to molecular testing or reference lab referral anyway.
Record turnaround times and action metrics (time to IPC notification, time to targeted therapy change) — measure impact, don’t guess it.
Bottom line: these strips are not magical, but they’re extremely useful when paired with a clear reflex pathway and rapid communication. Use them to accelerate decisions — not replace confirmatory science.
Does your lab use lateral-flow carbapenemase tests? Drop one practical rule that made them actually useful in your workflow👇
