PREGNANCY

- Fetus is very sensitive to radiation.
- Dose to fetus is usually less than mother, except when:
  - Internal contamination is present - bladder proximity to uterus
  - With radioiodine exposure - the fetal thyroid is very iodine avid after 12 weeks
- Requires patient specific dose estimate.
- Category C drugs (adverse effect in animals but not studied in humans)
- All colony stimulating factors
- Most antimicrobials
- Many antiemetics
- Water is a great way to shield from radiation.