Plasma/Serum Creatinine with eGFR Calculation (Chronic Kidney Function Assessment)

What Does This Test Measure?

Creatinine is a waste product from muscle metabolism that your kidneys normally filter out of your blood. Higher levels can indicate reduced kidney function. The eGFR calculation combines your creatinine level with other factors (like age, sex, and race) to estimate how efficiently your kidneys are working.

Why Is This Test Important?

This test is crucial for detecting early signs of chronic kidney disease (CKD), which can progress silently. It helps doctors monitor kidney health over time and guide treatment decisions, such as adjusting medications or managing blood pressure and diabetes.

How Is This Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where creatinine levels are measured, and the eGFR is calculated using a standardized formula. No special preparation is needed, but fasting may be recommended in some cases.

What Are Common Results?

Results are reported as a creatinine level (in mg/dL or µmol/L) and an eGFR value (in mL/min/1.73m²). While specific reference ranges vary by lab, lower eGFR values (below 60) often signal kidney dysfunction, while higher values (above 90) generally indicate normal kidney function.