Unfortunately, most of our tests aren't all the good and in and of themselves the results are pretty meaningless. Back in medical school we were taught that 80

Unfortunately, most of our tests aren't all the good and in and of themselves the results are pretty meaningless. Back in medical school we were taught that 80% of the diagnosis comes from the history, 10% from the physical examination and 10% from the investigations. Or something like that, it's the idea, not the numbers that matter. As a young computer nerd, this didn't sit well with me, but the more I practice medicine the more I understand it. My teachers didn't realise at the time, but I think they were actually talking about Bayesian probability. I think we are talking about this more and more in medicine, but unfortunately not all specialities have embraced it. There are lots of likelihood ratios published and good statistics available to help with diagnosis, but we don't use them effectively. There are some online tools and apps available to help navigate the literature, but I'm not really sure why we don't use them more.