<qa>  What is a negative urine pregnancy test?5. Female patients of childbearing potential must agree to use contraception during the study which can include abstinence with a secondary contraceptive option should the patient become sexually active. All women of childbearing potential must have a negative urine pregnancy test test must have a sensitivity of at least 25 IUML for human chorionic gonadotropin at the Baseline Visit. A female is considered of childbearing potential unless she is pre-menarche, postmenopausal with no menses for at least 12 months or surgically sterile. Reliable methods of contraception are hormonal methods or intrauterine devices in use for at least 90 days prior to the Baseline Visit or barrier methods plus spermicide use for at least 14 days prior to the Baseline Visit or a partner who has had a vasectomy at least 3 months prior to the Baseline Visit. 