Endogenous Creatinine Clearance from Stenting Site (24-Hour Urine and Blood Sample)

Why This Test Is Done

Your healthcare provider may order this test after a stent procedure to check how well your kidneys are functioning. Stents are often placed in blood vessels or urinary tracts to improve flow, and this test helps ensure your kidneys can handle the waste produced during healing. It’s particularly useful if you have a history of kidney issues or if the stent was placed in a kidney-related area.

What to Expect Before the Test

You’ll need to collect a 24-hour urine sample starting from the day after your stent procedure, collecting every bit of urine produced in a container. On the same day, a blood sample will be taken to measure baseline creatinine levels. Follow your provider’s instructions carefully to ensure accurate results.

What Happens During the Test

The 24-hour urine collection involves emptying your bladder completely at the start of the period, then collecting all urine for the next 24 hours. The blood sample is drawn at the same time as the urine collection period begins. Both samples are sent to a lab for analysis.

What the Results Mean

The test compares the amount of creatinine in your urine over 24 hours to the creatinine in your blood. Lower clearance rates may indicate impaired kidney function, while higher rates suggest normal or improved filtration. Your results will be discussed with your provider to guide further care.