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Mri in 1st trimester of pregnancy

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ACOG diagnostic imaging pregnancy MRI first trimester gadolinium guidance

MRI without contrast can be performed in the first trimester when it is clinically needed. It uses magnetic fields and radio waves, not ionizing radiation, and ACOG states that MRI is not associated with risk in pregnancy when used appropriately. Do not delay an important scan solely because it is the first trimester. ACOG imaging guidance
Key points:
  • Ultrasound is usually first choice for pelvic, obstetric, and many abdominal questions.
  • If ultrasound is inadequate or MRI better answers the urgent question, non-contrast MRI is generally acceptable, including early pregnancy.
  • Avoid gadolinium contrast routinely in pregnancy, especially in the first trimester. It should only be considered if it is expected to substantially improve diagnosis and maternal or fetal outcome, and no suitable alternative exists. ACOG’s gadolinium recommendation
  • Inform the ordering clinician and MRI radiology team that you are pregnant and how many weeks you are.
If this is for severe headache with neurologic symptoms, severe abdominal pain, suspected appendicitis, stroke symptoms, or another urgent condition, the benefit of timely imaging usually outweighs the theoretical concerns.
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