False Positive Paradox Calculator - Uni Calculators

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False Positive Paradox

Understand why positive test results are often misleading for rare conditions

Disease Prevalence

(e.g. 0.001 for 0.1%)

Test Accuracy (TPR)

(True Positive Rate)

False Positive Rate (FPR)

(Chance healthy person tests positive)

Prob. you HAVE the disease

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The Paradox: Even with a 99% accurate test, if a disease is rare, most people who test positive don't actually have it because the number of false positives from the healthy population outweighs the true positives.

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🧪

False Positive Paradox

Understand why positive test results are often misleading for rare conditions

Disease Prevalence

(e.g. 0.001 for 0.1%)

Test Accuracy (TPR)

(True Positive Rate)

False Positive Rate (FPR)

(Chance healthy person tests positive)

Prob. you HAVE the disease

--

--

The Paradox: Even with a 99% accurate test, if a disease is rare, most people who test positive don't actually have it because the number of false positives from the healthy population outweighs the true positives.

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