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Which of the following physiological parameter is most difficult to measure accurately?

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Which of the following physiological parameter is most difficult to measure accurately?

(a) Blood pressure

(b) Blood Flow

(c) Blood Volume

(d) Skin color

The question was asked by my college professor while I was bunking the class.

I'd like to ask this question from Application of Telemedicine topic in portion Telemedicine Technology of Biomedical Instrumentation

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Correct choice is (b) Blood Flow

For explanation: Blood flow is one of the most important physiological parameters and also one of the most difficult to measure accurately. This is because instruments for measuring the flow through blood vessels within the body have to meet certain stringent specifications; e.g. sensitivity and stability requirements depend upon the magnitude of flow, location and the diameter of the individual vessels.

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