Diastolic blood pressure is commonly measured using a sphygmomanometer and a stethoscope. The cuff is placed around the patient's upper arm and inflated to restrict blood flow. The pressure is then slowly released while listening with a stethoscope. The first sound heard is the systolic pressure, and when the sound disappears, the remaining pressure is the diastolic pressure. Automated blood pressure monitors are also widely used in clinical settings for ease and accuracy.