A Study Using Recombinant Human Chorionic Gonadotrophin (rhCG, Ovidrel®) in the Induction of Final Follicle Maturation and Early Luteinization in Chinese Women Undergoing in Vitro Fertilization and Embryo Transfer (IVF/ET)

Inclusion Criteria: * Infertility regular ovulatory menstrual cycles; * Early luteal phase serum levels: * FSH≤ 10IU/l * LH≤ 10IU/l * PRL≤ 30ng/ml * T≤ 50pg/ml * Haematology, blood chemistry, urinalysis normal * Both ovaries present * \< 3 previous ART cycles, no ART cycles for 2 menstrual cycles Exclusion Criteria: * With a poor response to gonadotrophin stimulation, such as ≤3 oocytes collected in any previous IVF cycle * Any medical condition may interfere with the absorption, distribution, metabolism or excretion of the drug. * Had previous severe ovarian hyperstimulation syndrome(OHSS) * A body mass index (BMI) \>25 kg/m2 * Any contraindication to being pregnant and/or carrying a pregnancy to term * Extra-uterine pregnancy within the last 3 months * A clinically significant systemic disease * Known infection with Human Immunodeficiency Virus (HIV), Hepatitis B or C virus * Abnormal gynaecological bleeding of undetermined origin * Known allergy or hypersensitivity to human gonadotrophin preparations * Simultaneous participation in another clinical trial