A patient has an order to have peak and trough drug levels done with the third dose of tobramy-cin (Tobrex). Which of the following statements accurately describes the timing of peak and trough doses?
a. Blood will be drawn before administration and 20 to 30 minutes after the antibi-otic dose.
b. A urine sample will be collected before administration and 20 to 30 minutes after the antibiotic dose.
c. Blood will be drawn on the morning and the evening of the next scheduled dose.
d. A 24-hour urine will be collected after the next scheduled dose.
ANS: A
Peak and trough serum drug levels are drawn to determine the adequacy of the calculated dose and to allow for changes to be made if necessary before nephrotoxicity or ototoxicity occurs.
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