EG-R026 | Sensitivity & Specificity Calculator
Diagnostic test performance calculator based on a 2 × 2 table. Enter true positives, false positives, false negatives and true negatives to generate core performance indicators and an automatic interpretation.
1. Enter the 2 × 2 table
Condition / disease present
Condition / disease absent
Test positive
Test negative
2. Results
Sensitivity
—
Specificity
—
| PPV | — |
| NPV | — |
| Accuracy | — |
| Observed prevalence | — |
| LR+ | — |
| LR− | — |
| False positive rate | — |
| False negative rate | — |
Automatic interpretation
Enter the four cells of the 2 × 2 table to generate an interpretation.
Interpretation guide
- Sensitivity answers: among people who truly have the condition, what percentage tested positive?
- Specificity answers: among people who truly do not have the condition, what percentage tested negative?
- PPV and NPV are strongly influenced by the prevalence in the tested population.
- Likelihood ratios help assess how much a test result changes the probability of disease.