Why tests are fuck all use if your 'health care provider' is a monkey

Next time someone says 'can't you just do a blood test' doctor, or the next time some unimaginative Noctor Fucktitioner fan suggests that medicine can be distilled into a series of flow charts, I can recommend no better remedy than a quick trip to DB's Medical Rants' article on 'Beyond sensitivity and specificity':

I must always concentrate to remember the importance of these concepts. A specific test gives very strong evidence for the diagnosis when positive. Remember that high specificity means low false positives. A sensitive test is best for ruling out disease. A high sensitivity means low false negatives. The naive person will ask, why not just develop a test which has both high sensitivity and high specificity. The problem is that as we increase sensitivity, specificity must decrease (and vice versa.)

Or you could just kick the stupid fucker in the nads.