The Renal Function Test (RFT) is a group of tests used to assess the overall health and function of the kidneys. It measures important parameters like creatinine, blood urea nitrogen (BUN), glomerular filtration rate (GFR), and electrolyte balance, helping to diagnose kidney diseases or monitor the effects of ongoing conditions like diabetes or hypertension.
Indications for Renal Function Test:
● Chronic kidney disease (CKD): To monitor kidney function in individuals with diabetes, hypertension, or heart disease.
● Acute kidney injury (AKI): Used to detect kidney dysfunction in hospitalized patients or those with acute conditions such as dehydration, infection, or drug toxicity.
● Pre-surgical assessment: To assess kidney function before surgeries, especially in patients with underlying medical conditions that could affect renal health.
How Renal Function Test Works:
● The RFT includes several tests:
● Blood Urea Nitrogen (BUN): Measures the amount of urea in the blood, a waste product filtered by the kidneys.
● Serum Creatinine: Measures the waste product creatinine, which is filtered by the kidneys.
● Glomerular Filtration Rate (GFR): Estimates kidney function based on creatinine levels and other factors.
● Electrolytes: Sodium, potassium, and bicarbonate levels are tested to evaluate kidney function and fluid balance.
Normal Range:
● Blood Urea Nitrogen (BUN): 7-20 mg/dL
● Serum Creatinine: 0.6–1.2 mg/dL
● GFR: 90-120 mL/min/1.73 m²
● Electrolytes: Normal ranges for sodium (135-145 mEq/L), potassium (3.5-5.0 mEq/L), and bicarbonate (22-28 mEq/L).
Abnormal Test Significance:
● Elevated BUN and creatinine: High levels may indicate acute kidney injury (AKI), chronic kidney disease (CKD), or dehydration.
● Low GFR: A low GFR suggests reduced kidney function, which is a key indicator of CKD.
● Electrolyte imbalances: Abnormal levels of sodium, potassium, or bicarbonate may indicate kidney dysfunction or other conditions like heart failure or liver disease.
Management Based on Results:
● For elevated BUN and creatinine: For deranged RFT we have to address the underlying cause, such as controlling blood sugar levels in diabetic nephropathy or adjusting medications or dialysis, fluid therapy or restriction if required.
● For low GFR: Early intervention with medications, dialysis, or kidney transplant may be required, depending on the stage of kidney disease.
Price in India:
Approx. ₹500 – ₹1000 for a renal function test.
Frequently Asked Questions
What causes kidney dysfunction?
Common causes of kidney disease and failure are high blood pressure, diabetes, medications, and genetic conditions.
Can kidney function improve?
Kidney function can be managed and improved with early diagnosis, treatment of underlying conditions, and lifestyle changes.
Disclaimer: Renal function tests should be interpreted in conjunction with clinical findings and other diagnostic tests to accurately assess kidney health.
How HealthPil Can Help:
HealthPil offers access to nephrologists who can help interpret your RFT results, recommend treatment options, and manage chronic kidney diseases.