A creatinine clearance was ordered and a midstream urine was collected and brought to the lab. What is the appropriate response?

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Creatinine clearance relies on measuring how much creatinine is excreted in urine over a defined period, typically 24 hours, along with a serum creatinine value. That requires a timed urine collection to determine the total urine volume and creatinine excretion, not a single random sample. A midstream urine is just a random specimen and cannot provide the necessary urine volume over time for an accurate clearance calculation.

So the appropriate response is to reject the midstream sample and contact the physician to clarify that a timed 24-hour urine collection with a concurrent serum creatinine measurement is required. If the order is indeed for a 24-hour collection, the clinician should be informed, and the patient should be instructed on proper collection procedures and a concurrent blood draw scheduled.

Why the other options don’t fit: accepting the random sample would yield an unreliable clearance result; asking for a second morning sample still doesn’t provide the 24-hour collection needed; requesting another midstream sample with creatinine measurement also fails to address the essential timed urine volume aspect of the test.