Answer:
The person taking your blood pressure wraps the cuff around your upper arm. Some cuffs go around the forearm or wrist, but often they're not as accurate.
Your doctor or nurse will use a stethoscope to listen for the appearance and disappearance of sound produced by the pulse in your elbow region. That's how the systolic and diastolic blood pressures are determined.
They’ll inflate the cuff to a pressure higher than your systolic blood pressure, and it will tighten around your arm. Then they'll release it. As the cuff deflates, the first sound they hear through the stethoscope is the systolic blood pressure.
