A patient is receiving intravenous vancomycin. The physician wants to know the medication's effectiveness, so a trough drug level is ordered. The nurse should obtain the patient's blood sample:


•Vancomycin levels are monitored to maintain a therapeutic dose. A trough is measured during the drug's lowest level, immediately before the next administered dose.

•Obtaining a blood sample too early will not represent a trough.

•Obtaining a blood sample after administering the medication would measure the peak, not trough.

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