The short version
- The words describe a lab cutoff, not a whole person.
- Cutoffs differ between tests.
- Eligibility rules that use serostatus are study-specific.
01Above or below a line
Each assay has a threshold. Results on one side are called positive; the other side negative.
02Why studies care
Some studies need people who already have antibodies; others need people who do not.
03Changing over time
A later test can differ from an earlier one. Timing matters.
04Not medical advice
Only a clinician or the study team can explain a personal result.
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