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Current research suggests that the progestin hormone in a specific type of birth control pill may increase a women's blood clot risk. However, it is unknown exactly how the progestin causes the increased risk. Researchers want to gather information to better understand why the progestin may increase a woman's blood clot risk. We hope this study can lead to developing a combined oral contraceptive pill with less risk factors for women.


You may be eligible to participate in this study if:

  • You are between the ages of 18 and 44
  • You have regular menstrual cycles
  • You use birth control pills

Qualified participants will be compensated up to $150 for time and travel. Study participation involves 2 visits to the Women's Health Research Unit on the Marquam Hill Campus of OHSU.

Who do I contact for additional information?

To find out more information and to learn if you are qualified to participate, complete the online form, call the Women's Health Research Unit's confidential recruitment line at 503-494-3666 or email us at