ITGB3 and Menorrhagia: Since the Leu33Pro polymorphism of the GP IIIa gene may be one of the main causes of genetically determined dysregulation of the hemostasis system and sensitivity to hemostatic therapy, the frequency of alleles and A1A2-genotypes of the polymorphism of the GP IIIa gene was determined in adolescents with menorrhagia, including the background of thyroid gland pathology and in healthy girls.