Answer 3 Phase I for systolic blood pressure; phase V for diastolic blood pressure. For most adults, phase I of the Korotkoff sounds (the appearance of sounds) is used as the point for measuring systolic blood pressure, whereas the point of the disappearance of sounds (phase V) is used to measure diastolic blood pressure. In pregnant women and young children, phase IV (muffling of sounds) may be used to determine diastolic blood pressure. Click here to return to the questions
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