This document provides instructions for performing Doppler sonography to measure blood flow velocity in the radial artery. It involves using ultrasound equipment and software to obtain an image of the radial artery Doppler waveform. The student is then asked to analyze the recorded waveform by performing pixel calibration, marking systole and diastole periods of five heart cycles, and calculating average velocity values in centimeters per second. The student fills out a protocol to document the measurements and calculations, and also writes a brief discussion and conclusion citing sources.