Creatinine is formed by the hydrolysis of creatine and phosphocreatine in muscle and by ingestion of meat. The majority of creatinine from the blood is filtered by the kidneys and excreted in the urine. A serum Creatinine test is used to measure the levels of creatinine in the blood. The test is helpful in assessing the condition and functioning of the kidneys.

Why is the test ordered?

A physician may prescribe a serum creatinine test to assess kidney function. A person may need the test based on the underlying conditions and risk of kidney damage. People with kidney disease may be asked to get the test done on a regular basis to track their kidney's health. Other factors, including high blood pressure, diabetes and over usage of certain medicines, may put kidneys’ health at-risk. In such cases, a doctor may prescribe a creatinine test.

When is the test ordered?

The test may be ordered when a physician observes signs and symptoms of kidney dysfunction, including a decreased amount of urine output; burning sensation, problems while urinating, abnormal discharge during urination, weakness, loss of appetite, difficulty sleeping and high blood pressure, in a patient.

How is the sample collected?

A blood sample is collected from the vein in the arm of the individual using a needle.

How to prepare for the test?

No special preparation is required for the test. Yet, The person undergoing the test may get instructions from his/her doctor. According to some studies, eating cooked meat before the test may elevate creatinine levels temporarily. Thus, it is better to avoid consuming meat before the test.

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