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Clinical Chemistry 33: 297-299, 1987;
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Clinical Chemistry, Vol 33, 297-299, Copyright © 1987 by American Association for Clinical Chemistry

Proteinuria in health and disease assessed by measuring the urinary protein/creatinine ratio

J Lemann Jr and BT Doumas

We measured daily excretion rates for urinary protein and the ratios of urinary protein to creatinine in 24-h urines and in untimed urines in 60 healthy adults, 30 patients with kidney disease, and 22 kidney- transplant recipients. The ratios for urinary protein/creatinine, mg/g, in untimed urines and in 24-h urines from the same subjects were closely correlated (r = 0.97) for rates of protein excretion ranging from normal (mean 44 mg/day) to nephrotic (maximum 19,300 mg/day). Because urinary protein/creatinine in healthy subjects never exceeded 100 mg/g, we propose that a ratio of less than 100 mg/g in untimed urines, obtained in the absence of exercise, fever, or other evidence of urinary tract disease, is a criterion of normal kidney function. Among patients with nephrotic syndrome (urinary protein excretion rate greater than or equal to 4000 mg/day), urinary protein/creatinine ratios always exceeded 2000 mg/g in both 24-h and untimed urines. Intermediate urinary protein/creatinine ratios (100 to 2000 mg/g) may reflect any type of kidney disease.


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Copyright © 1987 by the American Association for Clinical Chemistry.