Pharmacological and Parenteral TherapiesQuestion 1477 of 2368

The nurse must obtain a trough level for a client receiving an IV antibiotic. When should the blood sample be drawn?

  1. One hour after the dose is given
  2. When the drug is at its highest concentration
  3. Immediately after the dose is given
  4. Just before the next dose is given
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Correct answer: Just before the next dose is given

A trough level is the lowest drug concentration, which occurs just before the next dose.

Source: Nursing Fundamentals, 2nd edition (Open RN, Chippewa Valley Technical College, 2024), Infection: Assessment. Licensed under CC BY 4.0.

Practice the topic "Pharmacological and Parenteral Therapies"

Questions last reviewed: 18 October 2026