Yes, we did an episode on sensitivity and specificity:
Does a positive test mean that you have a disease? Does a negative test mean you’re healthy? Unfortunately, the answer to both these questions isn’t a definitive “yes”. How good a test is depends on it’s sensitivity and specificity. Learn about both, and why understanding these test characteristics is so important. Next week we’ll talk about what this all means in part II of this series, The Bayes Theorem.