When determining a patient's peak and trough levels, what action should the phlebotomy technician take?

When determining a patient's peak and trough levels, it is essential for the phlebotomy technician to first inquire about when the medication was administered. This information is crucial because peak levels are typically measured at a specific time after a medication dose is given, while trough levels are taken just before the next dose. Understanding the timing of the medication helps ensure that the blood sample is collected at the right intervals to accurately reflect the drug's concentration in the patient's system.

This close relationship between medication timing and sample collection is the cornerstone of effective monitoring, as it allows for the proper assessment of whether the drug is at therapeutic levels, which is critical in managing patient care.