Creatinine urine test: MedlinePlus Medical Encyclopedia (original) (raw)

The creatinine urine test measures the amount of creatinine in urine. This test is done to see how well your kidneys are working.

Creatinine in the blood can be measured by a blood test.

After you provide a urine sample, it is tested in the lab. If needed, your health care provider may ask you to collect your urine at home over 24 hours. Your provider will tell you how to do this. Follow instructions exactly so that the results are accurate.

Your provider may tell you to temporarily stop taking certain medicines that may affect test results. Be sure to tell your provider about all the medicines you take. These include:

• Antibiotics such as cefoxitin or trimethoprim
• Cimetidine, famotidine, and ranitidine

Do not stop taking any medicine before talking to your provider.

The test involves only normal urination. There is no discomfort.

Creatinine is a chemical waste product of creatine. Creatine is a chemical the body makes to supply energy, mainly to muscles.

This test is done to see how well your kidneys work. Creatinine is removed by the body entirely by the kidneys. If kidney function is not normal, the creatinine level in your urine decreases.

This test can be used for the following:

• To evaluate how well the kidneys are working
• As part of the creatinine clearance test
• To provide information on other chemicals in the urine, such as albumin or protein

Urine creatinine (24-hour urine collection) values can range from 500 to 2000 mg/day (4,420 to 17,680 mmol/day). Results depend on your age and amount of lean body mass.

Another way of expressing the normal range for test results is:

• 14 to 26 mg per kg of body mass per day for men (123.8 to 229.8 µmol/kg/day)
• 11 to 20 mg per kg of body mass per day for women (97.2 to 176.8 µmol/kg/day)

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

There are no risks with this test.

Landry DW, Gharavi AG. Approach to the patient with renal disease. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 100.

Oh MS, Briefel G, Pincus MR. Evaluation of renal function, water, electrolytes, and acid-base balance. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 15.

Updated by: Jacob Berman, MD, MPH, Clinical Assistant Professor of Medicine, Division of General Internal Medicine, University of Washington School of Medicine, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.