Synopsis
Select and justify imaging during pregnancy or breastfeeding without delaying essential diagnosis, while distinguishing radiation, contrast, MRI, and nuclear-medicine considerations.
- Pregnancy is not an absolute contraindication to necessary ionising imaging; balance fetal exposure against harm from missed or delayed maternal diagnosis.
- Use ultrasound or MRI without contrast when they answer the question adequately and promptly, but avoid substituting an inferior delayed test.
- After iodinated CT contrast or gadolinium MRI contrast, routine interruption of breastfeeding is unnecessary under current RCR and SoR advice.
Key red flags
Shock, major trauma, suspected pulmonary embolism, acute neurological deficit or surgical abdomen requires urgent senior imaging discussion.
A patient may have been discharged before pregnancy status or a critical result is clarified, requiring active recall and communication.
A breastfeeding nuclear-medicine patient needs radiopharmaceutical-specific advice rather than generic contrast reassurance.
Life-threatening maternal disease carries immediate risk to both patient and fetus and makes delayed diagnostic certainty particularly dangerous.
Reasoning priorities
Answer many obstetric, pelvic, abdominal and vascular questions without ionising radiation.
Use when diagnostically suitable, while recognising operator dependence, limited windows and incomplete visualisation.
Worked reasoning
A pregnant patient has serious symptoms and imaging will determine urgent treatment.
- Context: stabilise the patient, state the suspected diagnosis, gestation if known and the immediate management decision.
- Reasoning: compare the diagnostic adequacy and delay of ultrasound, MRI and the indicated ionising examination.
- Outcome: justify the test with greatest net benefit, obtain radiology input, and use a tailored protocol without unnecessary phases.
- Verification: document the discussion, ensure the result is actively received and communicate the treatment plan and residual uncertainty.