A patient is prescribed a trough blood level to evaluate the therapeutic effect of an antibiotic. When should the nurse schedule this blood test to be drawn?
1. a few minutes before the next scheduled dose of medication
2. 1–2 hours after the oral administration of the medication
3. 30 minutes after the intravenous administration of the medication
4. during the infusion of the antibiotic
Correct Answer: 1
Antibiotic peak and trough levels monitor therapeutic blood levels of the prescribed medication. The trough level is drawn a few minutes before the next scheduled dose. The peak level would be 1–2 hours after the oral administration of a medication and 30 minutes after the intravenous administration of a medication. Drawing the blood during the infusion of the antibiotic would not yield either a peak or a trough level.
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