What is the advised duration for discontinuation of breastfeeding before undergoing a PET scan?

The recommended duration for discontinuation of breastfeeding before undergoing a PET scan, particularly when using radiotracers that may be taken up by breast tissue, is typically 18-24 hours. This timeframe allows for the radiopharmaceutical to sufficiently clear from the mother's system, thereby minimizing any potential exposure to the breastfed infant.

Breastfeeding mothers who undergo a PET scan may receive radiopharmaceuticals, such as F-18 FDG, which can be excreted through breast milk. The advised interruption of breastfeeding for this period helps ensure that any residual activity in the breast milk decreases to levels that are considered safe for the infant, aligning with guidelines from various health organizations regarding the safety of radiopharmaceuticals during lactation.

This 18-24 hour duration strikes a balance between ensuring the safety of breastfeeding and the necessity of the medical examination, reflecting best practices in patient care while still recognizing the benefits of breastfeeding when possible.