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Clinical Chemistry 35: 1672-1674, 1989;
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Clinical Chemistry, Vol 35, 1672-1674, Copyright © 1989 by American Association for Clinical Chemistry

Urinary excretion of transferrin by non-insulin-dependent diabetics: a marker for early complications? [published erratum appears in Clin Chem 1990 Aug;36(8 Pt 1):1530]

CK Cheung, CS Cockram, VT Yeung and R Swaminathan
Department of Chemical Pathology, Prince of Wales Hospital, Shatin, N.T., Hong Kong.

We measured concentrations of transferrin (TRF, in micrograms), and creatinine (Cr, in millimoles) in samples of untimed urine from 53 healthy subjects and 157 non-insulin-dependent diabetic (NIDD) subjects. The urinary TRF/Cr ratio was significantly higher in the NIDD group (P less than 0.001). If NIDD subjects are grouped according to their Alb/Cr ratio into normal albuminuria (Group A, Alb/Cr less than 2.5 mg/mmol), microalbuminuria (Group B, Alb/Cr 2.5-26.8 mg/mmol), and macroalbuminuria (Group C, Alb/Cr greater than 26.8 mg/mmol), the TRF/Cr ratios in all three groups exceeded those for healthy controls. Moreover, this ratio was higher in Group B than in Group A and higher in Group C than in Group B. The value for TRF/Cr was clearly abnormal (i.e., exceeded the 95th percentile value found in healthy subjects) in 61%, 95%, and 100% of Group A, B, and C subjects, respectively. The TRF/Cr ratio was significantly higher in those NIDD subjects with clinical retinopathy, and it correlated with arterial pressure. Evidently, TRF/Cr may be increased early in NIDD subjects, and it may be a sensitive marker for detecting development of complications of diabetes.


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