Creatinine Clearance (from Wrist Cuff Blood Pressure Measurement)

How This Test Works

Your blood pressure is measured at your wrist using a standard cuff. A small blood sample is then taken from the same arm. The test calculates creatinine clearance by comparing your blood pressure reading to your creatinine levels, providing an estimate of kidney function without requiring a 24-hour urine collection.

What to Expect Before the Test

No special preparation is needed. Wear comfortable clothing and avoid eating or drinking for 2–3 hours before the test. Your blood pressure will be measured first, followed by a quick blood draw. The process takes about 10–15 minutes.

Common Uses for This Test

This test is often used to monitor kidney function in people with hypertension (high blood pressure), diabetes, or other conditions that may affect kidney health. It can also help assess kidney function in patients who cannot safely undergo traditional kidney function tests.

Potential Risks and Considerations

The test carries minimal risks. Mild bruising or soreness at the blood draw site may occur, but this is uncommon. If you have a history of bleeding disorders or take blood thinners, let your healthcare provider know before the test.