Renal function tests are a set of laboratory tests that provide valuable information about the functioning of the kidneys. The kidneys play a crucial role in maintaining the body’s internal environment by regulating fluid balance, electrolytes, and waste products. Renal function tests help assess the overall health and efficiency of the kidneys, diagnose various kidney disorders, and monitor the progression of certain medical conditions.

These tests are essential for healthcare professionals to evaluate kidney function, identify abnormalities, and formulate appropriate treatment plans. The most common renal function tests include blood and urine tests, and they collectively offer insights into different aspects of kidney function.

Blood Urea Nitrogen (BUN): BUN measures the amount of nitrogen in the blood that comes from urea, a waste product formed during protein metabolism. Elevated BUN levels may indicate kidney dysfunction or other conditions affecting the kidneys.

Serum Creatinine: Creatinine is a waste product generated from the breakdown of muscle tissue. Elevated levels of serum creatinine in the blood can be indicative of impaired kidney function, as the kidneys are responsible for filtering and excreting creatinine.

Glomerular Filtration Rate (GFR): GFR is a calculated value that estimates the rate at which the kidneys filter blood. It is considered one of the most reliable indicators of kidney function. A lower GFR may suggest decreased kidney function.

Sample Requirement

Blood Sample Type:

Venous Blood: A venous blood sample is most commonly used for LFT. It is drawn from a vein, usually in the arm, using a needle and a collection tube.