LAUSR

Background To study the inter-practice regional variation in the request of urinary albumin by general practitioners and compare to guideline recommendations. Methods A cross-sectional study enrolled laboratories from different Spanish autonomous communities. Laboratories were invited to report the number of urinary albumin requested by general practitioners during 2012 and 2014. Urinary albumin requested per 1000 inhabitants and the index of variability (90th centile/10th centile) was calculated, and compared between autonomous communities and time periods. To investigate potential inappropriate requesting in the management of diabetes and arterial hypertension, the actual number of requests was compared to the theoretical, based on prevalence and guideline recommendations. Results Urinary albumin requested per 1000 inhabitants was similar for years 2012 and 2014 (78.2 (60.1) to 85.4 (55.4); P = 0.235), as was the variability index (4.6 for both). There were significant differences between autonomous communities, with the indicator ranging from 46.0 (33.1) to 125.8 (64.3) (P < 0.05). The theoretical cut-off ratios of urinary albumin per 1000 inhabitants to manage patients with diabetes and arterial hypertension were, respectively, 78 and 159; no laboratory reached both values. Conclusions Requesting of urinary albumin showed a significant regional variability in primary care in Spain, and was insufficient to correctly monitor patients with diabetes and arterial hypertension.