Can You Get an X-Ray During Pregnancy?
Diagnostic radiation: real risks and when it is necessary
Single diagnostic X-rays expose the fetus to very low doses of radiation, which are generally safe. However, unnecessary radiation should be avoided. Ultrasound and MRI (without contrast) are radiation-free alternatives.
🩻 Radiation Doses in Common Tests
The threshold for fetal radiation damage is set at 50-100 mGy. Most diagnostic tests are far below this:
| Test | Approximate Fetal Dose | Risk |
|---|---|---|
| Dental X-ray | <0.01 mGy | Negligible |
| Chest X-ray | 0.002 mGy | Negligible |
| Limb X-ray | 0.001 mGy | Negligible |
| Mammogram | 0.004 mGy | Negligible |
| Head CT | <0.05 mGy | Very low |
| Abdominal CT | 8-25 mGy | Low but consider |
| Pelvic CT | 25-79 mGy | Moderate, consider alternatives |
⚠️ Risks of Radiation During Pregnancy
Risks depend on the dose and gestational age:
- Weeks 1-2: "all or nothing" effect — the embryo survives without damage or is lost.
- Weeks 3-8 (organogenesis): the most sensitive period for malformations, but only with doses >100 mGy.
- Weeks 8-25: theoretical risk of neurodevelopmental effects with doses >100 mGy.
- After week 25: lower sensitivity; risk with doses >500 mGy.
✅ Radiation-Free Alternatives
- Ultrasound: safe at any time during pregnancy.
- MRI (without gadolinium): safe, especially useful for soft tissues.
However, when an X-ray is medically necessary, the diagnostic benefit usually far outweighs the minimal radiation risk.
📋 Protective Measures
- Always inform the healthcare professional that you are pregnant or may be pregnant.
- Use a lead apron to protect the abdomen when possible.
- Request the minimum necessary dose (ALARA principle).
- Discuss with your doctor whether the test can be postponed until after delivery.
❓ FAQ
Is a dental X-ray dangerous during pregnancy?
No, a dental X-ray exposes the fetus to a negligible dose (less than 0.01 mGy), thousands of times below the damage threshold. It is safe with a lead apron.
Can I get a chest X-ray while pregnant?
Yes, if medically necessary. The fetal dose is extremely low (0.002 mGy). A protective apron is placed over the abdomen.
Is a CT scan safe during pregnancy?
A head or limb CT exposes the fetus to low doses. An abdominal or pelvic CT involves higher doses and alternatives should be considered. Always under medical guidance.
Sources
- ACOG — Guidelines for Diagnostic Imaging During Pregnancy and Lactation, Committee Opinion 723
- ACR (American College of Radiology) — Practice guideline for imaging pregnant patients
- ICRP — Protection of the pregnant patient
- NHS — X-rays and scans during pregnancy