MRI uses no ionising radiation and is not contraindicated in pregnancy — no harm to the baby has been documented. As a precaution, first-trimester scanning is generally kept for when it's needed and discussed with the radiologist. Gadolinium contrast is usually avoided in pregnancy, though the MRI itself can still be done, and many MRIs don't need contrast anyway.
Key takeaways
- MRI uses no radiation and is not contraindicated in pregnancy.
- No harm to the baby has been documented.
- First-trimester scanning is used when needed rather than routinely.
- Gadolinium contrast is usually avoided in pregnancy.
Because MRI uses magnets and radio waves rather than radiation, it’s often a good option when imaging is needed during pregnancy.[2]
What the guidance says
MRI is not contraindicated in pregnancy, and no harm to the baby has been documented.[2] As a sensible precaution, scanning in the first trimester is used when it’s needed rather than routinely, and the decision is discussed with the radiologist. The risks in the first trimester are considered theoretical and probably small, but aren’t fully established, so caution is applied.
Contrast in pregnancy
The MRI scan itself can be done in pregnancy when needed, but gadolinium contrast is usually avoided because the risk to the baby isn’t fully known.[1] Many MRIs don’t need contrast anyway. Tell the team if you are, or might be, pregnant so they can plan accordingly.
When MRI is used in pregnancy
MRI can be valuable in pregnancy — for example to assess the placenta or look more closely at the baby (particularly the brain) when ultrasound raises a question.[2] It’s also used for problems in the mother that ultrasound can’t fully answer, such as appendicitis.
Frequently asked questions
Is an MRI safe for my baby?
No harm to the baby has been documented, and MRI uses no radiation. As a precaution the first trimester is used carefully, and gadolinium contrast is usually not given.[2]
Can I have contrast for an MRI while pregnant?
Gadolinium is usually avoided in pregnancy. The MRI itself can still be done, and many scans don’t need contrast.[1]
Can I breastfeed if I do have gadolinium?
Yes — guidance concludes it’s safe to keep breastfeeding, as only a tiny amount reaches the milk.[1]
Sources
- RadiologyInfo.org (RSNA & ACR) — Contrast Materials (pregnancy) — www.radiologyinfo.org/en/info/safety-contrast
- RANZCR / InsideRadiology — Magnetic resonance imaging (MRI) — www.insideradiology.com.au/mri-hp/
