Serum Studies: Renal Function Tests

Renal function tests assess the kidneys' ability to remove waste, regulate fluids, and balance electrolytes. Key tests include:

Renal concentration tests, such as specific gravity, which normally ranges from 1.005-1.025, and urine osmolality, typically between 300-900 mOsm/kg in a 24-hour collection. These tests evaluate the kidneys' ability to concentrate urine and often indicate early signs of impairment.

Next, the 24-hour urine creatinine clearance test evaluates the kidneys' capacity to filter creatinine and estimates the glomerular filtration rate. Normal values range from 107-139 mL/min/1.73 m² for males and 87-107 mL/min/1.73 m² for females.

Additionally, serum tests, including serum creatinine, with normal levels ranging from 0.6 to 1.2 mg/dL in males and 0.4-1.0 mg/dL in females, and blood urea nitrogen, or BUN, generally from 8 to 20 mg/dL.