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Creatinine - urine

Creatinine is a breakdown product of creatine, which is an important part of muscle. Creatinine is removed from the body entirely by the kidneys. This article discusses the test done to measure the amount of creatinine in your urine.

A blood test can also be used to determine your creatinine level. See: Serum creatinine

  • Alternative Names

    Urine creatinine test

  • How the test is performed

    A random urine sample or a 24-hour collection may used. For information on how to collect a 24-hour urine sample, see: 24-hour urine collection.

  • How to prepare for the test

    Your health care provider may tell you to temporarily stop taking certain medicines that may interfere with test results. Such medicines include:

    • Cephalosporins (cefoxitin)
    • Cimetidine
    • Cisplatin
    • Gentamicin
    • Trimethoprim
  • How the test will feel

    The test involves only normal urination, and there is no discomfort.

  • Why the test is performed

    This test can be used as a screening test to evaluate kidney function. It may also be used as part of the creatinine clearance test. It is often used to provide information on other chemicals in the urine such as albumin or protein.

  • Normal Values

    Urine creatine (24-hour sample) values can range from 500 to 2000 mg/day. Results are highly dependent on your age and amount of lean body mass.

    Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

  • What abnormal results mean

    Abnormal results of urine creatinine are nonspecific, but may be due to any of the following conditions:

  • References

    Bazari H. Approach to the patient with renal disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 115.

Review Date: 8/7/2009

Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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