Have you ever gone into a doctor’s appointment and been left wondering who took your blood pressure? Who asked about that prescription? Chances are you’re not alone. Sometimes it’s difficult to know who’s who in the exam room. This week on “Take Care,” Dr. Robert Schmerling , associate physician and clinical chief of rheumatology at Beth Israel Deaconess Medical Center and associate professor in medicine at Harvard Medical School, talks about this exam room dilemma.