Negative STI Test Coverage Checker

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Compare a negative test with the dates of possible exposure. Check one test at a time, including whether the sample was taken too early or from a different body site.

Combo means antigen/antibody. Match the test and sample type on your report.
Use the collection date, not the day the lab sent the result.
If yes or unsure, the usual testing window will not be applied.
Sex dates

A timing match is not an infection-free certificate. This tool is not for interpreting positive results or tests after STI treatment. Your clinic or test manufacturer may specify different follow-up.

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How to use

  1. Select the exact test and the sample collection date. Use this checker only for a negative result or a future testing plan.
  2. Answer the medicine or sample-site questions that appear.
  3. Add each exposure date and calculate. Contact a clinician for symptoms or known exposure; do not wait for the displayed endpoint.

When not to wait for a test date

If HIV exposure may have occurred within 72 hours, contact urgent care or an emergency department about PEP now. Symptoms or a partner's diagnosis need medical advice even after a negative result.

Methodology

For HIV, the endpoint is the upper end of CDC's usual detection window: 45 days for a laboratory antigen/antibody test, 90 days for rapid antigen/antibody or antibody tests, and 33 days for NAT. Those windows are not applied when PrEP, PEP or other HIV medicines may affect interpretation. Chlamydia and gonorrhea use SHL's 14-day planning interval, with the same body site required. SHL is a UK service; follow your US clinic's test-specific instructions. Later encounters are assessed separately.

Sources