hey everybody doctor oh here this is the last video in this series of short terminology videos that help you to understand disease transmission disease spread epidemiology etc and that is sensitive versus specif specific or we will use the terms sensitivity versus specificity so here's how I remember them real quickly if you want like like almost just a little quick device sensitivity has an N in it so sensitivity I think no false negatives specificity has a P in it so I think no false positive so what does that actually mean though sensitivity would be I know that my patient has this disease what are the chances that the test that I'm doing is going to show that the patient has it and that's what I mean by no false positives if a test is a hundred percent sensitive then everyone that has the disease will be told they have the disease so you won't have any false negatives a false negative is when someone has a disease and a test shows they don't so a good example of that would be like rheumatoid arthritis some of these autoimmune disease tests are not very sensitive so for example people could have raging cases of rheumatoid arthritis and maybe only have a 70% chance that some of these antibody tests would actually say that they have the disease so that's a test that's not very sensitive so if a set of a test is sensitive there won't be these false negatives specificity would be I know my patient doesn't have a disease what are the what are the chances that the test is going to say that they have or don't have it so specificity would mean no false positives if someone doesn't have a disease what are the chances that the test comes back and says that they do so that's what a false positive is obviously when I think of false positives the first thing I think it would be like mammograms or any time people are doing imaging or full-body scans you can find all sorts of lumps and bumps and nodules in a human being and you have to assume the worst but if a test isn't very specific you can't be sure that it isn't a false positive that's know like on a mammogram if some if you find a lump or a bump it could be a lipoma it could be something completely benign but a false-positive readout would tell you that it would be something like breast cancer so that is sensitivity which means the test would have no false negatives specificity a test would have no false positives I hope that helps have a wonderful day be blessed