Doppler is used to evaluate which four aspects of blood flow?

• A. presence, velocity, character, and direction
• B. volume, rate, pressure, and flow
• C. turbulence, color, intensity, and speed
• D. shape, viscosity, radius, and time

Answer: (A)

Doppler ultrasound is about how blood moves, not just where it is. It first confirms flow exists in a vessel segment (presence). It then measures how fast the blood is moving (velocity), usually reporting peak systolic and end-diastolic values. It also shows the flow pattern or waveform—whether the flow is smooth and forward or becomes turbulent (character of the flow). Finally, it reveals the direction of flow relative to the transducer, indicating whether flow is toward or away from the probe. These four aspects together provide a full picture of hemodynamics. Other options mix measurements not directly provided by Doppler (like volume or pressure) or rely on display attributes rather than intrinsic flow properties.