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Kidney Function Test
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Kidney Profile Or Kidney Function Test (KFT)

The most commonly prescribed kidney test name that doctors recommend is KFT. The kidney function test (KFT test) or RFT test is a group of biochemistry blood tests that determine how properly your kidneys are functioning.

Why is the Kidney Test Performed?

Your doctor will recommend this KFT blood test under certain conditions:

  • As a part of your regular health checkups
  • To diagnose what diseases are affecting the kidneys
  • To screen high-risk people who are more prone to develop various kidney diseases
  • To monitor the progress of the existing kidney diseases treatment


Please check the price of the kidney profile test or kidney blood test in your nearby centers and other details.

Test Summary

Also known as Renal Function Tests, RFT, Kidney Profile Test, RFT Test
Test Type Imaging
Kidney function test includes Urea, Uric acid, creatinine, Urea/creatinine ratio
Preparation No special preparation
Reporting Within 24 hrs
Test price The price of a KFT test may vary from city to city and lab to lab
Also included in Health Insurance Plans
Related tests LFT, Ultrasound Scan KUB, GFR renal scan, CT scan KUB


What is a Kidney Function Test?

Kidneys are the pivotal organs of your body and play an array of functions including filtering the blood and separating the waste products from your body. Through urine, the kidneys extirpate the waste products from your body and also, maintain the pH and water balance of the body. The KFT test means Kidney Function Test and it monitors the functions of your kidneys.

What Tests are Done to Check Kidney Function?

The KFT test measures the following parameters in your blood.

1. Blood Urea Nitrogen (BUN)/ Urea

This test indicates the amount of urea nitrogen present in the blood. Urea is a nitrogenous by-product of the metabolism of protein, and its level in blood portrays the amount of nitrogen present in blood as urea. High BUN levels indicate that you may have kidney diseases, dehydration, and obstacles in the urinary tract due to kidney stones, prostate gland enlargement, etc.

Urea is excreted from your blood by the kidneys through urine. Excessive urea in blood is called uremia and may be responsible for various health issues including kidney diseases.

2. Uric Acid

This test also measures the amount of uric acid in your blood. Uric acid is a waste product formed from the breakdown of purines. This is also produced by the metabolism of proteinaceous food, especially red meat. Your kidneys excrete uric acid through urine and a small portion through stool. The uric acid test measures the level of uric acid in the blood and also, indicates whether your kidneys are functioning properly or not.

If excess uric acid is present in your blood, then it is called hyperuricemia. Hyperuricemia causes gout disease because uric acid crystals build up in the synovial fluid between joints. Hyperuricemia also forms the lumps of uric acid crystals called tophi under the skin. When these crystals accumulate in the kidneys they can cause kidney stones.

3. Creatinine

This test measures the level of Creatinine in your blood. Creatinine is a waste product that is created from the normal breakdown of muscles in the body. Excess creatinine disrupts the functions of kidneys. Certain foods like eating cooked meat, protein supplements, etc. may enhance the level of creatinine in your blood.

4. BUN/Creatinine Ratio

This ratio test compares the levels of nitrogen (as urea in the blood) to the levels of creatinine in the blood. This ratio gives a more accurate picture of kidney function. Low BUN to creatinine ratio can be caused due to several reasons, including a low protein diet, liver cirrhosis, rhabdomyolysis (muscle disease), syndrome of inappropriate antidiuretic hormone secretion (SIADH), pregnancy, and so on.

Kidney Function Test Normal Range

 1. Urea

  • 2.5-7.8 mmol/L

 2. BUN

  •  7 to 20 mg/dL

3. Uric Acid

  • Adult Female: 2.4 to 6.0 mg/dL
  • Adult Male: 3.4 to 7.0 mg/dL
  • Children: 3 to 4 mg/dL

4. Creatinine

  • Adult males: 0.6 to 1.2 mg/dL
  • Adult females: 0.5 to 1.1 mg/dL

5. BUN/Creatinine Ratio:

  •  12:1 to 20:1

During the Test Procedure

You need to visit your nearby labs or hospitals for tests to check kidney functions. An experienced lab technician will tie up an elastic band around your upper arm to find out your veins. After cleaning the area, the technician will insert a needle through your skin to collect the blood sample. The sample will be kept in a test tube for analysis.

The technician will place gauze and a bandage over the puncture site after the test. You may see a bruise or swell around the puncture area over the next few days.


Which conditions will increase the level of creatinine?

The conditions that will increase the level of creatinine in the kidney are,

      Damage or swelling of blood vessels in the kidneys
      Autoimmune diseases
      Bacterial infection of the kidneys
      Conditions that can block the flow of urine in the urinary tract like kidney stones
      Prostate disease
      Reduced blood flow to the kidney
      Congestive heart failure
      Complications of diabetes

What is hypernatremia and hyponatremia?

Low levels of sodium are called hyponatremia and high levels of sodium are known as hypernatremia.

What other tests are required to assess kidney function?

The other tests that are required to evaluate kidney function are Urinalysis, Urine protein, and Creatinine clearance.

How do I prepare for the kidney function tests?

You don’t need fasting for this test. You can eat and drink normally the same as you do.

What can I drink to improve my kidney function?

You should drink plenty of water that will give your kidneys the fluids they need to function properly. Drink plain water, without sugar, caffeine, or other additives. Drink 6-8 glasses of water every day to improve the health of your kidneys. 

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