Kidney Function Test (KFT): Serum Creatinine, Blood Urea & eGFR Calculation
Comprehensive clinical review of Kidney Function Tests (KFT / RFT): normal serum creatinine (0.7-1.3 mg/dL), blood urea, eGFR staging, and early renal...
A Kidney Function Test (KFT / RFT) measures waste filtration efficiency. Key parameters: Serum Creatinine (normal: 0.7-1.3 mg/dL in men, 0.6-1.1 mg/dL in women), Blood Urea Nitrogen (BUN: 7-20 mg/dL), and Estimated Glomerular Filtration Rate (eGFR: normal >90 mL/min). An elevated creatinine indicates that nephrons are filtering blood less effectively, signaling acute dehydration or chronic kidney damage.
1. Serum Creatinine as a Muscle Waste Biomarker
Creatinine is a steady metabolic waste product of phosphocreatine breakdown in skeletal muscle. Healthy kidneys filter it out completely without reabsorbing it. When kidney filtration drops by 50%, serum creatinine roughly doubles.
2. Why eGFR is More Accurate than Creatinine Alone
Elderly or malnourished patients with low muscle mass may have a 'normal-looking' creatinine of 1.0 mg/dL despite having severely impaired kidneys. The eGFR formula factors in age, gender, and weight to determine true filtration stage (Stage 1 to Stage 5 End-Stage Renal Disease).
3. Top Causes of Rising Creatinine in India
Uncontrolled long-term diabetes (diabetic nephropathy) and chronic high blood pressure are responsible for over 70% of kidney disease in India. Indiscriminate over-the-counter NSAID painkiller use (e.g. Voveran, Brufen) is another major preventable cause.
Top 8 Essential Indian Medicines: Branded MRP vs. Jan Aushadhi Generic Comparison
Compare average Indian retail MRP of top branded formulations against government-certified PMBJP Jan Aushadhi bioequivalent generic prices and active salts. Verified against official PMBJP formularies, NPPA price caps, and CDSCO regulatory registries.
| Brand Name | Leading Manufacturer | Active Salt Formulation (IP) | Branded MRP | Jan Aushadhi Price | Savings % |
|---|---|---|---|---|---|
| Augmentin 625 Duo | GlaxoSmithKline Pharmaceuticals | Amoxicillin Trihydrate 500mg + Potassium Clavulanate 125mg IP | ₹220.00 | ₹58.00 | 74% |
| Dolo 650 | Micro Labs Ltd | Paracetamol (Acetaminophen) 650mg IP | ₹34.00 | ₹5.50 | 84% |
| Pantocid 40 | Sun Pharmaceutical Industries | Pantoprazole Sodium 40mg IP (Gastro-resistant) | ₹155.00 | ₹8.00 | 95% |
| Azithral 500 | Alembic Pharmaceuticals | Azithromycin Dihydrate 500mg IP | ₹132.00 | ₹24.00 | 82% |
| Glycomet 500 | USV Private Limited | Metformin Hydrochloride 500mg IP | ₹24.00 | ₹4.50 | 81% |
| Shelcal 500 | Torrent Pharmaceuticals | Elemental Calcium 500mg + Cholecalciferol (Vit D3) 250 IU IP | ₹134.00 | ₹16.00 | 88% |
| Telma 40 | Glenmark Pharmaceuticals | Telmisartan 40mg IP | ₹92.00 | ₹7.50 | 92% |
| Montair-LC | Cipla Ltd | Montelukast Sodium 10mg + Levocetirizine Dihydrochloride 5mg IP | ₹210.00 | ₹18.00 | 91% |
| Combined 8-Drug Essential Therapy Basket Total: | ₹1,001.00 | ₹141.00 | 85.9% Net Savings | ||
Frequently Asked Questions (Clinical & Regulatory)
Q1: Can severe dehydration temporarily raise serum creatinine?
Yes, pre-renal azotemia occurs when dehydration reduces blood flow to the kidneys, raising urea and creatinine. Rehydrating with water normalizes levels.
Q2: Can eating a heavy meat meal before the test skew creatinine?
Yes, consuming large quantities of cooked red meat within 12 hours can cause a transient mild spike in blood creatinine levels.
Q3: Which routine diagnostic blood tests strictly require 10 to 12 hours of overnight fasting?
Fasting Blood Glucose (FBG), complete Lipid Profile (Total Cholesterol, Triglycerides, HDL, LDL), and Fasting Serum Insulin require 10–12 hours of water-only fasting to eliminate postprandial dietary chylomicrons and glycemic excursions from biasing baseline values.
Q4: What is the clinical difference between Fasting Blood Sugar and HbA1c tests?
Fasting blood sugar reflects glucose concentration at a single momentary blood draw, whereas HbA1c quantifies the percentage of hemoglobin glycated over the erythrocyte lifecycle, reflecting mean glycemic exposure across the preceding 90 to 120 days.
Q5: How do reference ranges on automated diagnostic lab reports vary between laboratories?
Reference intervals reflect the central 95% distribution of a validated healthy reference cohort tested on specific analyzer architectures (e.g., Roche Cobas, Abbott Architect). Results must always be interpreted against the specific testing laboratory's reported reference range.
This clinical guide is authored and reviewed in accordance with the regulatory standards of the Indian Pharmacopoeia (IP), Central Drugs Standard Control Organization (CDSCO) drug schedules, and Pradhan Mantri Bhartiya Janaushadhi Pariyojana (PMBJP) bioequivalence guidelines. All therapeutic recommendations and drug interaction warnings are cross-referenced with official statutory publications.
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