Final answer:
The phlebotomist should wait approximately 30 minutes after verifying medication administration before performing a peak level draw.
Step-by-step explanation:
When preparing for a peak level draw, the phlebotomist should wait approximately 30 minutes after verifying when the medications are administered. This waiting period allows for the medication to be metabolized and evenly distributed in the bloodstream. Waiting too long may result in the medication reaching its peak concentration before the draw, while not waiting long enough may result in inaccurate test results.