The creatinine blood test measures the level of creatinine in the blood. This test is done to see how well your kidneys work.
Creatinine can also be measured with a urine test.
A blood sample is needed.
The health care provider may tell you to temporarily stop taking certain medicines that can affect the test. Medicines include:
When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging sensation. Afterward, there may be some throbbing or slight bruising. These soon go away.
Creatinine is a chemical waste product of creatine. Creatine is a chemical made by the body and is used to supply energy mainly to muscles.
This test is done to see how well your kidneys work. Creatinine is removed from the body entirely by the kidneys. If kidney function is not normal, creatinine level increases in your blood. This is because less creatinine is released through your urine.
The creatinine level also varies according to a person's size and muscle mass.
A normal result is 0.7 to 1.3 mg/dL for men and 0.6 to 1.1 mg/dL for women.
Women usually have a lower creatinine level than men. This is because women usually have less muscle mass than men.
The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
Higher than normal level may be due to:
Lower than normal level may be due to:
There are many other conditions for which the test may be ordered, such as high blood pressure, diabetes or medication overdose. Your health care provider will tell you more, if needed.
There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Israni AK, Kasiske BL. Laboratory assessment of kidney disease: filtration rate, urinalysis, and proteinuria. In: Taal MW, Chertow GM, Marsden PA, et al., eds. Brenner and Rector’s The Kidney. 9th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 25.
Updated 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, Bethanne Black, and the A.D.A.M. Editorial team.
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