Which test is used to estimate kidney function in urology patients?

• A. Estimated glomerular filtration rate (eGFR)
• B. Urine culture
• C. Urinalysis
• D. Serum creatinine

Answer: (A)

Estimating how well the kidneys are filtering is best done with the estimated GFR. This value uses serum creatinine along with patient factors such as age, sex, and race in a standard formula, giving a more accurate picture of overall kidney function than creatinine alone. The eGFR provides a continuous measure to stage kidney disease, monitor changes over time, and guide important decisions in urology, like dosing medications or assessing risk before imaging that uses contrast.

Urine culture checks for infection in the urinary tract, urinalysis screens for abnormalities in the urine (like blood, protein, or infection markers), and serum creatinine by itself is a crude marker that doesn’t adjust for individual factors. In contrast, eGFR combines these aspects to estimate filtration capacity, making it the best choice for assessing kidney function.