The nurse is preparing to draw blood for measurement of a serum cyclosporine (Sandimmune) level. At what time should the serum cyclosporine level be drawn?
a. Two hours after the dose is administered
b. Just prior to the next dose
c. Six hours after the dose is administered
d. Timing of levels is irrelevant
ANS: B
The serum cyclosporine level should be drawn just prior to the next dose.
The level would be too high if the sample is drawn just 2 hours after the dose is given.
Six hours after the dose is not appropriate, because dosage adjustment is based on trough levels.
Timing is relevant to determining the correct dosage.
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