Journal
CLINICAL RHEUMATOLOGY
Volume 19, Issue 1, Pages 26-29Publisher
SPRINGER VERLAG
DOI: 10.1007/s100670050006
Keywords
calculation; creatinine clearance; estimation; muscle mass; pharmacology; prediction; renal function; rheumatoid arthritis; wasting formula
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The estimation of glomerular filtration rate is important for the medical treatment of patients with rheumatoid arthritis (RA). However, the determination of endogenous creatinine clearance (Clcr) from a 24-h urine collection is an unreliable and time-consuming procedure. We therefore tested the accuracy of six equations and one nomogram for the prediction of (Clcr from serum creatinine (Scr) in 38 patients with RA and 20 controls. A positive correlation was found for all methods in the controls (r = 0.83-0.94) and RA patients (r = 0.51-0.69). The methods did not overestimate Clcr in RA. In the RA group the simple formula published by Cockcroft [Clcr = ((140 - age) x body weight)/(72 x Scr), x 0.85 for females] showed the best correlation with the measured Clcr. In RA the Cockroft formula can reliably be used to predict Clcr from Scr.
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