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We recently developed and validated an equation 10 predicl GFR from serum creatinine (Pcr), which is more accurate than creatinine clearance measured from 24-hour urine samples or predicted from the Cockcroft-Gault (CG) equalion (Levey AS. Ann Intern Med 1999; 130: 877-884). GFR is expressed as mI/min/1.73 m2. Required variables include Per (mg/dl), age (y), race (black vs. non-black), gender, serum urea nitrogen (SUN, mg/dl) and albumin (alb, g/dI). In clinical practice and in retrospective studies, measurements of SUN and alb may not be available. Below we list the full MDRD Study prediction equation (6 variables), as well as alternative prediction equations including fewer variables derived from measurements in the same 1628 patients.