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[Significance of daily hydroxyprolinuria in the early diagnosis of nephrosclerosis in patients with chronic pyelonephritis].

Studies of daily excretion of hydroxyproline with the urine in patients with chronic pyelonephritis (CP) showed manifest hyper-hydroxyprolinuria at the early stages of the disease, which augmented with the development of renal insufficiency. Measurement of hydroxyproline in the urine of CP patients is proposed as a test reflecting the renal connective tissue metabolism at the early stages of the disease. It can be used for assessing the activity of the sclerotic process in the kidneys of CP patients, for predicting the disease course and outcome, and, probably, for developing methods of adequate pathogenetic therapy based on biochemical monitoring. The method is noninvasive, sufficiently informative, and available for clinical diagnostic laboratories.