Comparison of Serum Contraceptive Hormone Levels Between Normal Weight and Obese Users of the NuvaRing®

Obese subjects (BMI 30-39.9) will receive two contraceptive hormonal rings. During the second cycle of ring use, subjects will return to the study site for serial serum hormone measurements and transvaginal ultrasound twice weekly during four weeks of continuous use.

Normal weight subjects will also receive two contraceptive hormonal rings. During the second cycle of ring use, subjects will return to the study site for serial serum hormone measurements and transvaginal ultrasound twice weekly during four weeks of continuous use.