Andrew Elder, a professor at the University of Edinburgh talks about likelihood ratios in diagnostic testing, and how they’re helpful in thinking about how context changes the predictive value of a test.

This is part of a wider discussion on the evidence behind clinical examination of the cardiovascular system https://soundcloud.com/bmjpodcasts/evidence-for-examination

Read the full clinical review:
http://www.bmj.com/content/354/bmj.i3309