Adult nephrotic syndrome and acquired coagulopathies: Hageman factor deficiency.

Analysis of tests of coagulation and fibrinolysis from 20 adult nephrotics prior to the onset of therapy disclosed that 40 percent had low factor XII levels. The mean factor XI was normal. The platelet count and fibrinogen concentration were elevated. The findings of this study on adults are similar to those of Honig and Lindley(21) in the nephrotic syndrome of childhood. Subjects with minimal change disease constituted a small (15 percent) but readily segregated subpopulation without evidence of fibrinolysis in association with low factor XII activity. Prolongation of the activated partial thromboplastin time corresponded in every instance with factor XII activities of ≤30 percent. Lengthening of the one stage prothrombin time was not directly attributable to factor deficiencies.