Diagnosing PMR is easy before Pred initiation; but after steroids NO SO. Before Pred, PMR Dx from non-PMR (median probabilities 7.8 vs 2.8) w/ 86% sensitivity/83% specificity. After Pred Dx probability of PMR dropped to 1.0 w/ sensitivity 3.5%; not much better w/ Pred D/C https://t.co/q4TceeFByc