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About the test
What is this test done for?
The blood test is performed to detect the levels of creatinine in the body.
Why is it Done?
Creatinine is filtered by the kidneys. If the kidneys are not functioning optimally, then the levels of creatinine increase; this helps in diagnosis and prognosis of kidney problems.
When should it be performed?

The test is ordered if one is suffering from diabetes to check if the kidneys are working well. It is also done if the person is on antihypertensive medicines as the medicines may have an adverse effect on kidneys. If any of the following symptoms are present, the test is indicated:

  • Fatigue
  • Loss of appetite
  • Swelling of ankles, feet, face
  • Lower back pain
  • Nausea
  • Vomiting
  • Changes in urine output
  • High blood pressure
How is it done
A blood sample will be collected from a vein in your arm. Fasting is not requiredprior to sample collection.

The normal range for creatinine is 74.3 to 107 micromoles/litre. Since the creatinine levels increase with muscle mass, usually men have higher levels of creatinine as compared to women.

When creatinine is higher than normal, it can be suggestive of:

  • Dehydration
  • A high protein diet
  • A blocked urinary tract
  • Kidney problems, like kidney damage or infection.
  • Reduced blood flow to the kidneys
  • Congestive heart failure.
  • Complications of diabetes i.e. diabetic nephropathy
  • Hypertensive nephropathy

Negative results mean— the levels very rarely drop below normal. It could be because of low muscle mass, but it is not a worrisome finding.

Other Tests
Urine creatinine is also ordered for confirmatory diagnosis of kidney related problems. Also, renal function test may be performed for assessing the other parameters of the urinary tract.
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