Can radioactive iodine (RAI) affect fertility?
In men RAI can temporarily decrease sperm count and affect fertility. The dosage of radiation affects the degree to which sperm count decreases. The American Thyroid Association recommends sperm banking before high-dose RAI treatment. While radiation does temporarily affect the menstrual cycle there is no increased risk of infertility, miscarriage or congenital defects. It is recommended, however, that women wait six-12 months before trying to get pregnant to ensure that the disease is not recurrent. RAI should not be given to women who are breastfeeding.
