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What is a Kidney Function Test (KFT)?
The Kidney Function Test (KFT), often called a Renal Profile, is a group of blood tests that assess how efficiently your kidneys are filtering waste from your blood. Your kidneys act as the body's natural filtration system — removing toxins and balancing essential minerals. A KFT is vital for early detection of kidney stress, which often presents no symptoms until advanced stages. It provides a comprehensive picture of your renal filtration efficiency and electrolyte balance.
⚠ Important: While fasting is not strictly required for a standalone KFT, avoid eating cooked meat for 4–6 hours before the test as this can temporarily raise creatinine levels and affect eGFR accuracy. Stay well hydrated before the test. Inform your phlebotomist of any medications you are taking, especially NSAIDs, diuretics or ACE inhibitors.
Key Markers in a KFT Profile
A comprehensive KFT panel includes several essential measurements:
- Serum Creatinine — waste product from muscle metabolism. High levels indicate the kidneys are not filtering effectively. The most widely used marker of kidney function.
- Blood Urea / BUN (Blood Urea Nitrogen) — nitrogenous waste from protein breakdown. Elevated in kidney dysfunction and dehydration.
- Uric Acid — high levels can lead to kidney stones or gout, indicating the kidneys are struggling to excrete waste products.
- eGFR (Estimated Glomerular Filtration Rate) — calculated from creatinine, age and gender. The gold standard for determining the stage of Chronic Kidney Disease (CKD).
- Electrolytes (Sodium, Potassium, Chloride) — vital minerals the kidneys regulate to maintain heart rhythm, nerve function and fluid balance.
- Calcium & Phosphorus — kidney disease disrupts calcium and phosphorus balance, leading to bone problems.
Normal KFT Reference Ranges
| Parameter | Normal Range |
|---|---|
| Serum Creatinine (Men) | 0.7 – 1.3 mg/dL |
| Serum Creatinine (Women) | 0.6 – 1.1 mg/dL |
| Blood Urea | 7 – 25 mg/dL |
| BUN (Blood Urea Nitrogen) | 6 – 24 mg/dL |
| Uric Acid (Men) | 3.4 – 7.0 mg/dL |
| Uric Acid (Women) | 2.4 – 6.0 mg/dL |
| eGFR | Above 90 mL/min/1.73m² (normal) |
| Sodium | 136 – 145 mEq/L |
| Potassium | 3.5 – 5.0 mEq/L |
| Chloride | 98 – 107 mEq/L |
Your doctor will interpret all KFT parameters together as a pattern rather than any single value in isolation.
Stages of Chronic Kidney Disease (CKD) by eGFR
Understanding your eGFR result:
- eGFR above 90 — Normal kidney function (Stage 1 if other markers are abnormal)
- eGFR 60–89 — Mildly reduced function (Stage 2) — monitor closely
- eGFR 45–59 — Mild to moderately reduced (Stage 3a) — specialist referral advised
- eGFR 30–44 — Moderately to severely reduced (Stage 3b) — nephrology consultation needed
- eGFR 15–29 — Severely reduced (Stage 4) — prepare for dialysis or transplant planning
- eGFR below 15 — Kidney failure (Stage 5) — dialysis or transplant required
When is a KFT Recommended?
Your doctor may recommend a Kidney Function Test if you:
- Have been diagnosed with diabetes or hypertension — the two leading causes of kidney damage
- Experience swelling in the legs, ankles or face (edema)
- Have reduced or foamy urine output
- Have blood in your urine (hematuria)
- Experience persistent lower back or flank pain
- Are on long-term NSAIDs, antibiotics or other nephrotoxic medications
- Have a family history of kidney disease or polycystic kidney disease
- Are overweight or have metabolic syndrome
- Need pre-surgical kidney function assessment
- Have elevated uric acid or history of kidney stones or gout
- As part of a routine annual health checkup
What Conditions Does KFT Help Diagnose or Monitor?
- Chronic Kidney Disease (CKD)
- Acute Kidney Injury (AKI)
- Diabetic nephropathy (kidney damage from diabetes)
- Hypertensive nephropathy (kidney damage from high blood pressure)
- Kidney stones (nephrolithiasis)
- Gout (elevated uric acid)
- Glomerulonephritis (kidney inflammation)
- Polycystic Kidney Disease (PKD)
- Urinary tract obstruction
- Monitoring dialysis patients
KFT Test Price in Kolkata
Kidney Function Test (KFT) Price: ₹900
Avoid cooked meat 4–6 hrs before | Stay hydrated | Free home collection above ₹2,000
Avoid cooked meat 4–6 hrs before | Stay hydrated | Free home collection above ₹2,000
Tests Commonly Ordered Alongside KFT
- Urine Routine & Microscopy (Urine R/M) — checks for protein, blood and casts in urine alongside blood KFT markers
- Urine Microalbumin — the most sensitive early marker of diabetic kidney damage before creatinine rises
- CBC (Complete Blood Count) — kidney disease causes anemia due to reduced erythropoietin production
- Liver Function Test (LFT) — liver and kidney are often evaluated together in a comprehensive metabolic panel
- HbA1c & Blood Sugar — diabetes is the leading cause of CKD and should always be assessed alongside KFT
- Lipid Profile — dyslipidemia accelerates kidney damage and is frequently assessed alongside KFT
- Serum Calcium & Phosphorus — kidney disease disrupts mineral balance requiring regular monitoring
Home Collection for KFT Test in Kolkata
Apollo Diagnostics provides home blood sample collection for Kidney Function Tests across North and Central Kolkata. Our phlebotomists arrive at your doorstep with sterile single-use equipment. Samples are processed using advanced automated analyzers at our NABL-certified central laboratory.
- Home collection available: 7:00 AM – 2:30 PM Daily
- Avoid cooked meat 4–6 hours before collection
- Stay well hydrated before the test
- Free home collection on orders above ₹2,000
- Digital reports delivered to WhatsApp within 24 hours
Quick Links
→ Apollo Diagnostics Nagerbazar → Full List of Individual Tests → Book Home Collection → Full Body Checkup Packages
→ Apollo Diagnostics Nagerbazar → Full List of Individual Tests → Book Home Collection → Full Body Checkup Packages
Frequently Asked Questions
Q1. What is the Kidney Function Test used for?
The KFT assesses how efficiently the kidneys are filtering waste from the blood. It is used to detect Chronic Kidney Disease, monitor diabetic and hypertensive kidney damage, evaluate kidney stones and gout, assess electrolyte imbalances and monitor patients on nephrotoxic medications. It is also part of routine annual health checkups.
Q2. What parameters are included in a KFT?
A standard KFT includes Serum Creatinine, Blood Urea, BUN, Uric Acid, eGFR (calculated), Sodium, Potassium and Chloride. Some panels also include Calcium and Phosphorus. Together these markers assess waste filtration, electrolyte balance and the stage of kidney function.
Q3. Does the KFT require fasting?
Fasting is not strictly required for a standalone KFT. However avoid eating cooked meat for 4–6 hours before the test as it can temporarily raise creatinine levels and affect eGFR accuracy. Stay well hydrated. If KFT is combined with Lipid Profile or blood sugar, fast for 8–10 hours.
Q4. What is the KFT test price at Apollo Diagnostics Kolkata?
The Kidney Function Test price at Apollo Diagnostics is ₹900. Home collection is available free on orders above ₹2,000.
Q5. What does high Creatinine mean?
High creatinine in the blood indicates that the kidneys are not filtering effectively. Creatinine is a waste product of muscle metabolism that healthy kidneys clear continuously. Elevated creatinine can result from Chronic Kidney Disease, acute kidney injury, dehydration, high protein intake or certain medications. A single elevated reading should be confirmed with repeat testing and eGFR calculation.
Q6. What is eGFR and why is it important?
eGFR (Estimated Glomerular Filtration Rate) is calculated from your creatinine level, age and gender. It estimates how many millilitres of blood your kidneys filter per minute. An eGFR above 90 is normal. As eGFR falls the stage of Chronic Kidney Disease increases from Stage 1 to Stage 5 (kidney failure). eGFR is the gold standard for tracking kidney function over time and guiding treatment decisions.
Q7. Can diabetes and hypertension damage the kidneys?
Yes. Diabetes and hypertension are the two leading causes of Chronic Kidney Disease globally. High blood sugar damages the delicate filtering blood vessels in the kidneys (glomeruli), leading to diabetic nephropathy. High blood pressure damages kidney blood vessels over time, reducing filtration capacity. Both conditions require regular KFT monitoring — typically every 6 months — to detect damage early and slow progression through medication and lifestyle changes.
Q8. Is home collection available for KFT test in Kolkata?
Yes. Apollo Diagnostics provides home blood sample collection for KFT tests across Dum Dum, South Dum Dum, Nagerbazar, Satgachi, Baguiati, Lake Town, Bangur, Kaikhali, Sealdah, Entally, Phoolbagan, Tangra and surrounding areas. Book by calling or WhatsApping +91 8660434628.
Q9. How long does it take to get KFT results?
KFT results are typically available within 24 hours of sample collection. Reports are delivered digitally to your WhatsApp or email.
Q10. Which centre processes my KFT sample in Kolkata?
All samples collected across North and Central Kolkata are processed at Apollo Diagnostics Nagerbazar — Nandarani Apartment, 8A Narasingha Avenue, Nagerbazar, Dum Dum, Kolkata 700074. Our lab is NABL-certified and ISO-certified.
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