Screening vs Confirmatory Testing
Direct answer: Screening tests prioritize sensitivity to catch all possible cases; confirmatory tests prioritize specificity to confirm the true cases. Rapid tests are screening-grade.
| Screening test | Confirmatory test | |
|---|---|---|
| Goal | Catch all possible cases | Confirm the true cases |
| Priority | High sensitivity | High specificity |
| Typical example | Rapid antibody/antigen test | PCR, Western blot, RPR titer |
Why two tiers
A reactive rapid test is presumptive — it flags who needs confirmation. This is standard practice for HIV, HCV, syphilis and drug-of-abuse testing.
- HIV antibody reactive → confirm by serial tests per national algorithm
- HCV antibody reactive → confirm with HCV RNA
- Syphilis reactive → confirm with non-treponemal RPR titer
Frequently Asked Questions
Why are there two tiers? Screening catches all possible cases (high sensitivity); confirmatory verifies the true cases (high specificity).
Related knowledge
References
- WHO diagnostic testing guidance (point-of-care and rapid diagnostics).
By Progene Bio Regulatory Affairs Team · Medical Device QA · Medical disclaimer · Last reviewed: 2026-09-12