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What is this test?

A urine creatinine test measures the concentration of creatinine in your urine. Creatinine is a chemical waste product produced by normal muscle metabolism. Normally, your kidneys filter creatinine from your blood and excrete it in urine. When kidney function is impaired, creatinine can accumulate in the blood, and its levels in urine may change.

Why is it performed?

This test is primarily used to evaluate kidney function. It helps doctors determine if your kidneys are properly filtering waste from your blood. The test may also be used to: assess the severity of kidney disease, monitor kidney function over time, check for dehydration, and evaluate the accuracy of other urine tests by providing a baseline measurement.

How is the sample collected?

For this test, you will need to provide a urine sample. Your healthcare provider will give you specific instructions. Typically, you will be asked to collect a clean-catch midstream urine sample in a sterile container. It's important to follow the collection instructions carefully to ensure accurate results. You may be asked to collect urine over a 24-hour period for some creatinine tests, though this specific test mentions 'unspecified duration,' so follow your doctor's specific instructions.

Understanding your results

Normal creatinine levels in urine vary based on factors such as age, sex, muscle mass, and diet. High urine creatinine may indicate conditions like muscle breakdown, intense exercise, or a high-protein diet. Low urine creatinine may suggest kidney problems, severe kidney disease, or muscle wasting conditions. Your healthcare provider will interpret your results in the context of your overall health and other test findings.