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Diagnostic 2×2 calculator
Counts only. Prevalence in your table drives PPV/NPV — do not transplant them to a different population.
n
200
Sensitivity
80.0%
Specificity
90.0%
PPV
88.9%
NPV
81.8%
LR+
8.00
LR−
0.22
Educational only. Not medical advice, not a regulatory determination, and not a substitute for qualified RA/QA, legal, clinical, or statistical counsel. Diagnostic 2×2 calculator does not submit to FDA, Notified Bodies, or IRBs.
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