Information in this record refers to the use of sodium iodide I 123 as a diagnostic agent. A US Nuclear Regulatory Commission subcommittee and the American Thyroid Association recommend discontinuation of breastfeeding for only 3 to 4 days after a diagnostic scan[1,2] and UK authorities recommend a cessation of 42 hours after a 20 MBq dose.[3] The safest course of action may be to have breastmilk tested at a nuclear medicine facility at a hospital. When the radioactivity is at a safe level the mother may resume breastfeeding. A method for measuring milk radioactivity and determining the time when a mother can safely resume breastfeeding has been published.[4] Mothers who receive a dose less than 400 MBq for a thyroid scan need not refrain from close contact with their infants.[5]