The percentage of patients with a disorder who have a positive test for that disorder is a test’s sensitivity.
Sensitivity is the True positive rate. The ability to detect disease. In other words, among patients with a disease, sensitivity is the probability that the disease will be detected by the test. A test with high sensitivity is great for screening. It may have false-positive results but does not miss many people with the disease. That is, it has a low false-negative rate. Mathematically, Sn is the number of true positives divided by the number of people with the disease. Sn = A / ( A + C)