Even so, it is important that your doctor knows you are pregnant when an x-ray, CT or nuclear imaging examination is being considered. Being aware of your pregnancy can help your doctor select the most appropriate imaging exam for your condition and keep your exposure to radiation as low as reasonably achievable to produce the necessary information.
If you had an x-ray or CT exam after conception, but before you discovered you were pregnant, you should not be overly concerned. In fact, imaging exams that do not include the pelvis will delivery very little radiation to the baby or fetus.
The amount is less than the baby would receive from radiation that exists in our natural environment. Every pregnant woman is exposed to radiation in small quantities every day from their natural environment. A carefully planned CT examination will not deliver radiation at levels that would put the growth and development of your baby at risk. The risks rise as multiple CT exams of the pelvis are performed.
If you had a CT examination of your pelvis when you did not know you were pregnant, you should discuss this with your physician. Those machines aren't used in the United States or Europe anymore, though you may still come across them in other countries. They don't emit enough radiation to harm your baby. You are exposed to some radiation when you fly in an airplane it's cosmic radiation from the sun and other stars , but it's less radiation than when you get a chest X-ray — so your baby isn't at risk.
Even if you work regularly with X-ray technology, or are part of a flight crew, you're unlikely to be exposed to enough radiation to harm your baby. The Federal Aviation Administration has guidelines for how much radiation exposure is safe for a pregnant flight crew member. Talk to your employer about how to calculate your exposure, and share any concerns you have with your doctor or midwife.
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