Day 22🧪 Welcome back to 30 Days of ASCP: Make It Make Sense, because once you get it, you never forget it. Sensitivity and specificity describe how a test behaves, not how good or bad it is. Sensitivity answers the question: how good is this test at detecting disease when disease is truly present? A highly sensitive test has very few false negatives, meaning if the test is negative, you can confidently rule the disease out. That’s why sensitive tests are used for screening. Specificity answers