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Microplate ELISA for urine microalbumin: reference values and results in patients with type 2 diabetes and
Tsu-Lan Wu1, Pi-yueh Chang, Chia-Chi Li
1Department of Pathology, Chang Gung Memorial Hospital, Taipei, Taiwan.
Abstract:
An ELISA for urine microalbumin using microtiter plates has been developed. The assay uses polyclonal anti-human albumin antibody for coating the microtiter plates and the same antibody conjugated with horseradish peroxidase for detection. The assay sensitivity is 1.6 microg/ml. Results by this in-house ELISA show good correlation (r = 0.99) with those obtained by a commercial assay using the Behring BNII autoanalyzer. Within-day and between-day CVs are 10%. Reference values for microalbumin in 769 urine specimens from healthy Chinese subjects were higher in women than men and higher in subjects 50 yr than in those <50 yr of age. Elevated mean concentrations of urine microalbumin were observed in patients with type 2 diabetes and CVD. This in-house ELISA is simple, sensitive, precise, and especially suited for laboratories without expensive autoanalyzers.
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