The S/D ratio cannot be measured when which one of the following conditions is present?

Question

Quizplus · Accepted Answer

The S/D ratio, or systolic/diastolic ratio, is a measure used in Doppler ultrasound to evaluate blood flow, particularly in the umbilical artery. It cannot be measured when diastolic flow is absent because the ratio requires both systolic and diastolic flow values to calculate. If there is no diastolic flow, the denominator in the ratio would be zero, making the calculation impossible.

The S/D Ratio Cannot Be Measured When Which One of the Following