FaridabadBy Dr B.C. Gupta, MD · 2026-08-15
A kidney function test, or KFT, is a group of blood tests that checks how well your kidneys are filtering waste and balancing fluids and minerals.
What does the test measure?
A KFT typically measures creatinine and urea, waste products that healthy kidneys remove from the blood. It also measures electrolytes such as sodium, potassium, and chloride, which the kidneys help keep in balance. Some panels include uric acid and calcium.
How to prepare
Some KFTs may require fasting, so confirm with the laboratory. The sample is a blood draw, and results are usually available the same day. Depending on the panel, a urine sample may also be needed.
What the result can mean
Raised creatinine or urea can suggest that the kidneys are not filtering as well as they should. Abnormal electrolyte levels can affect heart rhythm, muscle function, and fluid balance. These are general patterns. Kidney function can be affected by dehydration, medicines, and many conditions, so your doctor will interpret the results with your overall health and may repeat the test.
When is it ordered?
A KFT is ordered to investigate symptoms such as swelling, changes in urination, or high blood pressure, to monitor a known kidney condition, to check the effect of certain medicines, or as part of a routine health check.
This article is for general information only and is not medical advice. Always discuss your results and any health concerns with your doctor.
