ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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If the red blood cells are traveling away from the transducer, what type of Doppler shift is present?

  1. Negative

  2. Unequivocal

  3. None

  4. Positive

The correct answer is: Negative

When red blood cells are traveling away from the transducer, a negative Doppler shift is present. This is because the frequency of the echo signal received by the transducer will be lower than the frequency of the transmitted ultrasound due to the movement of the red blood cells away from the source. This shift towards lower frequencies is indicative of a negative Doppler shift. Options B, C, and D are incorrect because in this scenario of red blood cells moving away from the transducer, only a negative Doppler shift would be observed.

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