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  • Title: Urinary fibrin-fibrinogen degradation products in nephrotic syndrome.
    Author: Hall CL, Pejhan N, Terry JM, Blainey JD.
    Journal: Br Med J; 1975 Feb 22; 1(5955):419-22. PubMed ID: 803853.
    Abstract:
    The urinary concentration of fibrin-fibrinogen degradation products (F.D.P.) was measured in 90 patients with proteinuria above 2 g/1 and correlated with proteinuria, differential protein clearances, serum urea and creatinine, and renal biopsy findings. There was a linear correlation (r equals 0-7; P less than 0-001) between the urinary F.D.P. excretion and the selectivity of the proteinuria such that patients with highly selective proteinuria excreted only small amounts of F.D.P. whereas those with non-selective proteinuria excreted much higher levels. There was a significant correlation between the urinary F.D.P. excretion and the urine:serum (U:S) ratio of IgG excretion but not with the U:S ratio or urinary excretion of albumin or transferrin. Sephadex G200 column chromatography of the concentrated urine in 26 cases showed that patients with highly selective proteinuria excreted predominantly F.D.P. of low molecular weight in the urine whereas those with non-selective proteinuria excreted mainly fibrinogen and products of high molecular weight. Hence the type and quantity of F.D.P. in the urine are determined primarily by the differential filtration of fibrinogen and the various degradation products from the plasma through the glomerular basement membrane, which in turn is determined by the "pore size" of the basement membrane. In clinical nephrology measurement of the urinary F.D.P. level provides a rapid and convenient means of estimating the differential protein clearance.
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