If you are a breastfeeding mother and need a CT, MRI, or X-ray scan, you may feel anxious. Many mothers are told by well-meaning friends or even healthcare staff that they must "pump and dump" (express and discard breast milk) for 24 to 48 hours after receiving contrast dye to protect their babies.
Fortunately, modern clinical guidelines show that this is rarely necessary.
Standard X-rays and Ultrasounds: 100% safe
Standard X-rays, mammograms, and ultrasounds do not use contrast dye.
- Sound waves and X-rays do not remain in your body.
- They do not affect your breast milk or your baby.
- You can breastfeed immediately before and after these scans without any precautions.
CT and MRI Contrast: Safe to continue nursing
If you need a scan "with contrast," you will receive an injection of iodine-based dye (for CT) or gadolinium-based dye (for MRI).
According to the American College of Radiology (ACR) and European safety guidelines:
- Less than 1% of the contrast dye injected into your vein enters your breast milk.
- Of that tiny amount in the milk, less than 1% is absorbed by the baby’s digestive tract.
- This means the total amount of dye reaching the baby is less than 0.01% of the maternal dose, which is clinically negligible and completely safe.
You do not need to pump and dump after standard CT or MRI contrast. You can continue breastfeeding normally. If you remain concerned, you can choose to suspend nursing for 12 to 24 hours as a personal preference, but it is not medically required.
Nuclear medicine: Specific precautions are required
Unlike CT or MRI, nuclear medicine scans (like thyroid scans, bone scans, or PET/CT) inject radioactive tracers into your bloodstream. Because these radioactive substances can concentrate in breast milk, strict precautions are required.
Depending on the specific tracer used:
- You may need to pump and dump for 12 hours to several days.
- In some cases, you may need to stop breastfeeding entirely for that specific baby.
Always inform the nuclear medicine team that you are breastfeeding. They will provide you with a specific time-frame for when it is safe to resume nursing based on the exact radioactive tracer used.
A practical close
Standard scans, including those with CT and MRI contrast, are safe for breastfeeding mothers and babies. If you are undergoing a nuclear medicine scan, discuss specific safety protocols and pumping schedules with the nuclear medicine team before your appointment.