During the measurement of blood pressure with a sphygmomanometer, diastolic blood pressure is recorded when you no longer hear the beating sounds. This is your diastolic pressure.
While measuring the diastolic blood pressure watch the mercury level in the sphygmomanometer.
Note the sphygmomanometer reading (the number the mercury has reached) when the pulse reappears. Record this as the systolic pressure.
Deflate the cuff further until the pulse disappears. Record this reading as the diastolic pressure.
Blood pressure is measured in units of millimeters of mercury (mmHg). If someone has a reading of 132/88 mmHg, they have a systolic blood pressure of 132 mmHg and a diastolic blood pressure of 88 mmHg.
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