Pharmacokinetics and Pharmacodynamics · USMLE Step 1

What does the term Clearance (CL) refer to in pharmacokinetics?

  1. Plasma volume cleared of drug per unit time
  2. Fraction of drug bound to plasma proteins
  3. Time for plasma concentration to fall by half
  4. The total volume of distribution
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Correct answer: Plasma volume cleared of drug per unit time

Clearance defines the theoretical volume of plasma cleared of drug per unit time and determines elimination efficiency.

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