Use this protocol in conjunction with the UW Medicine laboratory estimated GFR (eGFR by MDRD). This should be through the patient’s laboratory results.

If the eGFR is unavailable, use the GE slide rule to estimate the GFR (based on the Cockroft Gault Equation (may overestimate the GFR in patients with ascites, and very obese patients.)

For notes on calculating the GFR, see the accompanying document “Renal Impairment: How to Estimate the GFR.”