While in residency/internship, he had to develop his own diagnostic techniques. Once, making rounds, he diagnosed a patient as having atrial fibrillation. He did not so much as touch the patient. The proctor asked how he had made the (correct) diagnosis. "I observed the pulse in his neck, sir," he responded.
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My ex-cardiologist, now retired, once had a friend fly into town. The friend came to his house, ready to go golfing. "Let's go!" he said.
"You are not going anywhere except the emergency room."
"What? I feel fine. Let's go."
"You're about to have a heart attack."
Eventually he convinced his friend and drove him to the hospital. The guy had a heart attack in the Emergency Room.
--Boris
My uncle had a symmetrical experience: went to the doctor for his annual checkup, was informed he was 100% okay, then dropped dead leaving the doctor's office.