Biochemistry · Kidney Health
KFT / RFT – Kidney Function Test
Evaluates how well your kidneys are filtering waste from the blood. Essential for detecting CKD, acute kidney injury, and monitoring dialysis patients.
How Well Are Your Kidneys Filtering?
Your kidneys are remarkable organs — each containing about one million tiny filters called nephrons that collectively process approximately 200 litres of blood every single day. The KFT (Kidney Function Test), also called RFT (Renal Function Test), checks how efficiently this filtration is happening by measuring waste products, electrolytes, and filtration rate in your blood.
The challenge with kidney disease is that symptoms only appear once over 60–70% of kidney function is already lost. This makes KFT especially important as a preventive screening test — particularly for India's 77 million diabetics and the large hypertensive population, both of whom are at disproportionately high risk of developing Chronic Kidney Disease (CKD).
Parameters Tested
| Parameter | Normal Range | Significance |
|---|---|---|
| Serum Creatinine | M: 0.7–1.3 mg/dL · F: 0.5–1.1 mg/dL | Best single kidney function marker |
| Blood Urea / BUN | Urea: 15–45 mg/dL | Nitrogen waste from protein metabolism |
| eGFR | > 90 mL/min/1.73m² | Estimated filtration rate — CKD staging |
| Sodium (Na+) | 136–145 mEq/L | Fluid balance regulation |
| Potassium (K+) | 3.5–5.0 mEq/L | Cardiac rhythm — dangerous if elevated |
| Uric Acid | M: 3.5–7.2 mg/dL · F: 2.6–6.0 mg/dL | Gout risk, renal stone formation |
| Calcium (Ca++) | 8.5–10.5 mg/dL | Bone and kidney stone correlation |
| Phosphorus | 2.5–4.5 mg/dL | Elevated in CKD; parathyroid link |
Who Should Get Tested?
Preparation
No fasting required for KFT in isolation. Stay well-hydrated. Avoid heavy protein meals the night before (can temporarily raise creatinine). Inform your doctor of any medications such as NSAIDs, ACE inhibitors, or diuretics.
Test Price at Velys Hospital
₹150
Inclusive of collection · Same-day report
Book KFT at Velys Hospital
Nephrology-backed interpretation · NABL-quality results · Same-day report