A patient is taking gentamicin (Garamycin) on once daily regimen. The prescriber orders a blood sample to be drawn for measurement of a trough level of the drug. When should the nurse draw the blood?
a. 1 hour after the infusion is complete
b. 8 hours after the infusion is complete
c. 12 hours after the infusion is complete
d. 1 hour prior to the next infusion
ANS: D
Samples for trough levels should be drawn just prior to the next dose (when divided daily doses are used) or 1 hour before the next dose (when a single daily dose is used).
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