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About the test
What is this test done for?
Renal function test (RFT) is a group of tests like blood urea nitrogen, creatinine, creatinine clearance test and urine creatinine which help to assess the normal functioning of the kidney.
Why is it Done?
The test is ordered to assess the functioning of the kidneys in persons suffering from renal failure or on dialysis treatment or patients suffering from cardiac diseases or diabetes.
When should it be performed?
Renal function test is performed when a person suffers from diabetes or cardiac diseases or conditions related to kidney diseases. The following symptoms address the need to perform the test:
  • swelling of both feet
  • shortness of breath
  • very poor urine output
  • itching all over the body
In a case of renal calculi, to assess kidney damage. Before certain surgeries in aged people. To assess the level of hydration of an individual in cases of severe bleeding etc.
How is it done
You need to fast for 12 hours overnight before giving a blood sample from your arm the next morning.
Kidney function tests involve a group of tests like creatinine, glomerular filtration rate (GFR) and blood urea nitrogen (BUN).
  • Creatinine: normal levels are 0.7 to 1.3mg/dL. Higher than these levels indicate kidney damage or damage to blood vessels, bacterial infection or kidney stones. Lower levels are not commonly seen and might be due to decrease in muscle mass.
  • GFR: normal level is above 90mL/min/1.73m2. If it is below 60mL/min/1.73m2, it suggests some kidney damage and chronic kidney disease.
  • BUN: these levels rise in cases of gastrointestinal bleeding, in severe protein breakdown.
Other Tests
Ultrasound of pelvis may be ordered to assess a structural defect of kidneys that might be leading to faulty RFT. Urine test will also help in assessing any urinary infection or kidney condition.
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