<qa>  What must be done within 24 hours before lenalidomide is prescribed for?9. Females of childbearing potential FCBP must have 2 negative pregnancy tests sensitivity of at least 50 mIUmL prior to initiating lenalidomide. The first pregnancy test must be performed within 10-14 days before and the second pregnancy test must be performed within 24 hours before lenalidomide is prescribed for Cycle 1 prescriptions must be filled within 7 days. 