 - Females of childbearing potential who are not surgically sterile, not refraining from sexual activity, or not using reliable contraception methods. Females of childbearing potential must not be pregnant negative serum β-Human Chorionic Gonadotropin HCG at screening and negative urine β-HCG prior to flortaucipir F 18 injection or breastfeeding at screening. Females should agree to avoid becoming pregnant by refraining from sexual activity or using reliable contraceptive methods for 24 hours following flortaucipir F 18 injection administration. 