Dear Doctor: Urgent care missed her blood clot. Here's what went wrong

Dear Doctor Roach: I recently had an experience that brought out the desire in me to help educate health care providers in real time. I had an unexplained swelling of just one ankle. My primary care physician is on leave, so I was referred to urgent care. I was seen by a physician assistant. They asked me a series of questions that they read off their computer and ruled out a deep vein thrombosis (DVT). (They said that the likelihood was -2.) They diagnosed me with plantar fasciitis.