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Diabetes Care, Vol 17, Issue 5 425-427, Copyright © 1994 by American Diabetes Association

ARTICLES

Variability of urinary albumin excretion in patients with microalbuminuria

G Phillipou and PJ Phillips
Endocrine and Diabetes Service, Queen Elizabeth Hospital, Woodville, South Australia.

OBJECTIVE--To estimate the within-person variability (SDi) for the overnight urinary albumin excretion rate (AER) in diabetic patients with persistent microalbuminuria. RESEARCH DESIGN AND METHODS--Thirteen normotensive diabetic patients in stable medical control, with normal renal function and without any associated cardiovascular or other clinical disorders, collected overnight urines at monthly intervals during one year. AER was determined by radioimmunoassay. RESULTS--Analysis of individual series of AER showed a significant trend (P < or = 0.01) in three cases. The remaining patients (eight men, two women; seven with insulin-dependent diabetes mellitus) had a median mean AER 102 micrograms/min (range 30-238 micrograms/min). Because the individual mean AERs were significantly associated with their respective SDis, the data was loge transformed. LogeSDi was estimated as 0.420, and its 90% probability range (0.353-0.490) was calculated using the bootstrap method. CONCLUSIONS--The high within-person variance for AER means that only people with an initial AER in the range of 53-76 micrograms/min have a high probability (P > or = 0.95) of being classified as microalbuminuric (20-200 micrograms/min) on a subsequent specimen. However, subjects with an initial AER > or = 53 or > or = 80 micrograms/min have a 95 and 99% probability of persistent microalbuminuria. The large variability of AER limits its potential as a serial marker to detect any gradual deterioration of established renal dysfunction.
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Copyright © 1994 by the American Diabetes Association.