Coagulation disoders as a cause of juvenile uterine bleeding in 12–18 years adolescent girls

Obligatory detection of vWF blood levels, progesterone and testosterone levels in addition to routine tests are necessary to identify the causes of juvenile uterine bleeding. If progesterone level less than 1.75 ng/ml, and vWF activity in first phase of the cycle varies in the range 30–39 %, hyperpolymenorrhea may be due to coagulation disorders. Diagnostic range of vWF activity, within which hyperpolymenorrhea considered as a clinical sign of latent coagulation “disorders”, should be extended to 35 % for patients with O(I) blood group and to 39 % for patients with A (II), B (III) and AB (IV) blood group.