Hemostatic changes in women using a monthly injectable contraceptive for one year

Area of Science:

• Reproductive endocrinology and hematology.

Background:

• Monthly injectable contraceptives combining norethisterone enantate and estradiol valerate are used for birth control.
• Understanding their impact on hematological parameters is crucial for safety assessments.

Purpose of the Study:

• To evaluate the effects of a one-a-month contraceptive injection on various hematological parameters in Chinese women over one year.

Main Methods:

• 42 healthy Chinese women were randomized into a treatment group (n=22) or control group (n=20).
• Blood samples were collected at multiple time points before, during, and after the one-year treatment period.
• Hematological parameters including coagulation factors, antithrombin III, and leucocyte count were analyzed.

Main Results:

• Prothrombin time and fibrinogen showed significant fluctuations in both groups.
• Factor X and antithrombin III functional activity decreased significantly (14% and 20%, respectively) after 12 months of treatment.
• Hemoglobin levels increased in the treatment group after the third injection.

Conclusions:

• Monthly injectable contraceptives caused significant decreases in Factor X and antithrombin III functional activity.
• While some hematological changes were observed, their clinical relevance remains uncertain.