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Definitions for diagnostic efficacy of [18F]flutemetamol PET
| Metric | Definition |
|---|---|
| Sensitivitya |
TP/TP + FN |
| Specificitya |
TN/TN + FP |
| Accuracyb |
TP + TN/TP + FN + TN + FP |
| Positive predicative value (PPV)a |
TP/TP + FP |
| Negative predictive value (NPV)a | TN/TN + FN |
aThe highest possible value of the result is 1. This result generally does not depend on disease prevalence.
bThe highest possible accuracy is 1. Accuracy is a function of disease prevalence in the population being tested.
