You said every doctor should have one with them "like a stethoscope". I don't know where you got "replace" from... My point is that a stethoscope is an essenti

You said every doctor should have one with them "like a stethoscope". I don't know where you got "replace" from... My point is that a stethoscope is an essential tool for assessing every patient. An ultrasound is a specialized tool for assessing a very small subset of patients.