Kidney Function Test (KFT / RFT): Normal Ranges, Creatinine & Urea Chart
The Kidney Function Test (KFT), also called Renal Function Test (RFT), is an essential diagnostic profile that monitors the renal clearance capacity of the body. Healthy kidneys filter approximately 180 liters of blood daily, eliminating metabolic waste products like Urea and Creatinine while reabsorbing essential electrolytes. Elevated blood levels of Creatinine and Urea signify impaired glomerular filtration, acute kidney injury (AKI), or chronic kidney disease (CKD).
When and Why Doctors Prescribe KFT / RFT (Renal Panel)
- Routine annual screening for all hypertensive and diabetic patients (Diabetic Nephropathy surveillance)
- Swelling in feet, ankles, hands, or puffiness around eyes (Edema)
- Changes in urination: Reduced output, foamy urine, or increased nighttime frequency
- Pre-procedure contrast dye safety clearance for CT scans or angiographies
- Gout assessment or monitoring chronic hyperuricemia
Standard Pathology Reference Range Chart
Verified clinical brackets for adults and diagnostic significance
| Test Parameter | Standard Unit | Male Normal Range | Female Normal Range |
|---|---|---|---|
| Serum Creatinine | mg/dL | 0.7 – 1.3 | 0.6 – 1.1 |
If High: Reduced kidney filtration: Chronic Kidney Disease, acute dehydration, urinary tract obstruction, or high muscle mass / creatine supplement intake. If Low: Severe muscle atrophy, myasthenia gravis, or advanced liver disease. Creatinine above 2.0 mg/dL in non-CKD baseline indicates acute renal compromise. | |||
| Blood Urea (BUN) | mg/dL | 15 – 45 | 15 – 45 |
If High: Renal impairment, severe dehydration, gastrointestinal bleeding, high-protein diet, or heart failure. If Low: Severe liver disease, low protein intake, or overhydration. | |||
| Serum Uric Acid | mg/dL | 3.5 – 7.2 | 2.6 – 6.0 |
If High: Hyperuricemia: Gout arthritis, renal stones, high purine diet (red meat, seafood, beer), or chemotherapy tumor lysis. If Low: Wilson disease, Fanconi syndrome, or low-purine vegetarian diet. | |||
| eGFR (Estimated Glomerular Filtration Rate) | mL/min/1.73m² | > 90 | > 90 |
If High: Optimal kidney filtration capacity. If Low: 60-89: Mild loss; 30-59: Moderate loss (CKD Stage 3); 15-29: Severe loss (CKD Stage 4); <15: Kidney failure (CKD Stage 5). | |||
How to Prepare for Your KFT / RFT (Renal Panel)
- 1Avoid heavy intake of cooked red meat and stop creatine bodybuilding supplements 48 hours prior to the test.
- 2Drink normal amounts of water. Do not severely dehydrate yourself or over-hydrate right before sample draw.
Need KFT / RFT (Renal Panel) done at home?
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Frequently Asked Questions (FAQs)
Why is eGFR more reliable than Serum Creatinine alone?
Creatinine level depends on muscle mass. A young muscular athlete may have a Creatinine of 1.2 mg/dL with healthy kidneys, whereas an elderly frail woman with Creatinine 1.1 mg/dL might already have significant kidney dysfunction. eGFR mathematically adjusts for age, gender, and body surface area.
Can high Creatinine come down to normal?
Yes, if caused by acute prerenal factors like temporary dehydration, medication toxicity, or severe heat exhaustion. However, chronic long-term scarring from diabetes or hypertension requires lifestyle and medical stabilization to stop progression.