The fluid most commonly sampled to characterize the pharmacological actions of drugs is:

A. serum
B. urine
C. blood
D. mucus


c
Rationale: Blood is routinely sampled to characterize a drug's pharmacological actions. Serum is incorrect because it is just a part of what makes up blood, urine is not often used for this purpose, and mucus is not used at all in this manner.

Health Professions

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