MDRD GFR Calculator - Estimate Kidney Function

MDRD GFR Calculator

Estimate Glomerular Filtration Rate (eGFR) to assess kidney function and stage chronic kidney disease (CKD).

Patient Data

mg/dL
Value must be between 0.2 and 15.0 mg/dL.
years
MDRD equation is validated for adults (18–120 years).
Used in the original MDRD study equation.
Try Example: 55yo Female, Cr 1.2 (eGFR ~75.9)

Enter patient details and click Calculate to see results.

This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, screening assessment, or treatment. Always consult a qualified healthcare professional before making any health-related decisions.

Results

--
mL/min/1.73 m²
G--

Description

Understanding Your Calculation

How MDRD GFR Is Calculated

The Modification of Diet in Renal Disease (MDRD) study equation estimates glomerular filtration rate based on serum creatinine, age, sex, and race. It provides a standardized assessment of kidney function normalized to body surface area (1.73 m²).

eGFR = 175 × (Scr)-1.154 × (Age)-0.203 × (0.742 if female) × (1.212 if Black)

Where: Scr is serum creatinine in mg/dL, and Age is in years. This formula is re-expressed for standardized creatinine assays.

CKD Staging Guide

Chronic Kidney Disease (CKD) is categorized based on GFR levels. A lower GFR indicates worse kidney function. The table below outlines the standard stages.

GFR Value (mL/min/1.73 m²) Stage Description
≥ 90 G1 Normal or high kidney function
60–89 G2 Mildly decreased kidney function
45–59 G3a Mild to moderately decreased
30–44 G3b Moderate to severely decreased
15–29 G4 Severely decreased kidney function
< 15 G5 Kidney failure
Medical Disclaimer: This calculator is intended for informational and educational purposes only. It is not a diagnostic tool. The MDRD equation has not been validated for patients under 18, pregnant women, or patients with serious comorbid conditions. Always consult a healthcare professional for medical advice and interpretation of lab results.

Calculation logic verified using publicly available standards.

View our Accuracy & Reliability Framework →