7. Females of childbearing potential (FCBP) must have a negative serum or urine pregnancy test (sensitivity of at least 50 milli-International unit (mIU/mL) 10-14 days prior to starting lenalidomide. A female of childbearing potential is a sexually mature woman who: 1) has not undergone a hysterectomy or bilateral oophorectomy; or 2) has not been naturally postmenopausal for at least 24 consecutive months (i.e., has had menses at any time in the preceding 24 consecutive months).