Benralizumab Pregnancy Exposure Study

Exposure is defined as any dose of benralizumab for any length of time from 8 weeks prior to Last Mentrual Period (LMP) through the end of pregnancy, as reported by the mother and validated through medical record review. The 8-week cut-off prior to LMP is based upon the terminal half-life of benralizumab of approximately 15 days (clearance of benralizumab is based on five half-lives).

Exposure to asthma medications for any number of days, at any dose, and at any time from LMP up to the date of enrollment, but no exposure to benralizumab during pregnancy or within 8 weeks prior to LMP.