Sensitivity & Specificity Calculator
Calculate diagnostic test performance metrics
2x2 Contingency Table:
| Disease + (Actual) | Disease - (Actual) | |
|---|---|---|
| Test + | ||
| Test - |
About Sensitivity and Specificity
Sensitivity (True Positive Rate): Probability of a positive test given disease is present. = TP / (TP + FN)
Specificity (True Negative Rate): Probability of a negative test given disease is absent. = TN / (TN + FP)
PPV: Probability of disease given a positive test.
NPV: Probability of no disease given a negative test.
Likelihood Ratios: Indicate how much a test result changes the odds of having disease.