Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Sensitivity and Specificity assessment for diagnostic accuracy.
| Test outcome (index test) | Disease status (reference standard result) | |
| True positives (a) | False positives (b) | Test positives (a + b) |
| False negatives (c) | True negatives (d) | Test negatives (c + d) |
| Index test positive (T+) | Index test negative (T−) | |
