Women of reproductive age who undergo controlled ovarian hyperstimulation (COH) for IVF are recruited for this study.

Inclusion Criteria:

To be eligible for inclusion into this study, each subject must satisfy the following criteria:

1. Participants must be aged 21 to 35 years
2. Body mass index (BMI) < 38.
3. Serum results for cycle day 3 FSH <10 mIU/ml.
4. Be willing and able to comply with the protocol for the duration of the study.
5. Have voluntarily provided written informed consent under WIRB, prior to any study-related procedure that is not part of normal medical care, with the understanding that the subjects may withdraw consent anytime without prejudice to their future medical care.
6. Have passed a psychological and physical screening.

Exclusion Criteria:

A patient may NOT be entered into the study if she presents with ANY of the following criteria:

1. Clinically significant systemic disease.
2. Known endometriosis Grade III - IV (ASRM classification).
3. Any previous cycle indicating a low response to gonadotropin stimulation (defined as retrieval of < 10 eggs at retrieval)
4. Previous ovarian surgery
5. Known allergy or hypersensitivity to recombinant gonadotropin preparations or any other study-related medications.
6. Known current substance abuse.
7. Simultaneous participation in another clinical trial.
8. Current smoker.
9. An extrauterine pregnancy within the last 3 months before OCP treatment commences.
10. Previous participation in similar study at different centers.