Ovarian Hyperstimulation and Fibrin Clot Properties.

Infertility is a common problem. Assisted reproductive techniques (ART) increases the chance of getting pregnant by couples undergoing such treatment. Unfortunately, the numer of live births after ART remains still low. Over the past three decades, physicians have tried to improve infertility diagnosis and increase its successful treatment. An effort aimed at increasing effectivenes of diagnosis resulted in hypothesis that one of probable reasons of infertility may be the occurrence of microclots, which worsen implantation and embryos development. There are currently no published studies describing the effects of different ovarian hyperstimulation protocols on hemostasis (coagulation and fibrinolysis).

The parameters of thrombin generation and efficiency of fibrinolysis will be evaluated in women qualified for ovarian hyperstimulation. The study may improve the effectiveness of ART.

Inclusion criteria

• infertility defined based on the WHO 2010 criteria

Exclusion criteria

• ovarian involvement
• oral contraceptives use within previous 3 months
• dienogest therapy within 3 months until ART
• thrombotic events in the medical history
• severe hypertension
• diabetes mellitus
• the presence of known VTE risk factors, including obesity, recent major surgery with prolonged immobilization or trauma,
• deficiency of antithrombin, protein C or protein S,
• antiphospholipid syndrome,
• known malignancy,
• any chronic inflammatory diseases (e.g. rheumatoid arthritis)
• advanced chronic renal disease (estimated glomerular filtration rate [eGFR] <30 ml/min),
• international normalized ratio (INR) more than 1.2 at the day of blood draw
• pregnancy.