HTLV testing: if the initial ELISA is reactive, what is the next recommended step?

HTLV testing: if the initial ELISA is reactive, what is the next recommended step?

• A. Report as reactive
• B. Repeat ELISA
• C. Perform Western Blot
• D. Do nothing

Answer: (B)

When a screening test for HTLV comes back reactive, the safest next step is to repeat the ELISA to verify that the reactivity is reproducible. This helps rule out false positives that can occur from assay variability, transient nonspecific reactions, or technical issues. If the repeat ELISA remains reactive, you then move on to a confirmatory test such as a Western blot (or another approved confirmatory assay) to establish true seropositivity. If the repeat is nonreactive, you can report the result as nonreactive, avoiding a false-positive classification. This two-step approach ensures that only truly reactive results trigger the more definitive, but more complex, confirmatory testing.

When a screening test for HTLV comes back reactive, the safest next step is to repeat the ELISA to verify that the reactivity is reproducible. This helps rule out false positives that can occur from assay variability, transient nonspecific reactions, or technical issues. If the repeat ELISA remains reactive, you then move on to a confirmatory test such as a Western blot (or another approved confirmatory assay) to establish true seropositivity. If the repeat is nonreactive, you can report the result as nonreactive, avoiding a false-positive classification. This two-step approach ensures that only truly reactive results trigger the more definitive, but more complex, confirmatory testing.