Which of the following body fluids is the most commonly used to characterize pharmacologic drug actions?

A) Urine
B) Cerebrospinal fluid
C) Blood
D) Sputum


C) Blood
Blood is the body fluid most commonly used to characterize pharmacologic drug actions. Usually, there are correlations between pharmacokinetics and pharmacodynamics that demonstrate the relationship between drug dose and blood or other biological fluid concentrations.

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