CAMRT Radiography Practice Exam

During which trimester of pregnancy is the fetus considered most sensitive to radiation exposure?

1. First trimester

2. Second trimester

3. Third trimester

4. All trimesters equally

The correct answer is: First trimester

The first trimester is considered the period when the fetus is most sensitive to radiation exposure. During this stage, critical development of major organ systems occurs, making the embryonic tissue particularly vulnerable to the harmful effects of radiation. Any exposure can interfere with normal growth and development, potentially leading to congenital abnormalities or other issues. As pregnancy progresses into the second and third trimesters, the fetus becomes somewhat less sensitive to radiation in terms of causing major developmental abnormalities. However, certain risks still exist throughout the entire pregnancy, but the first trimester presents the highest risk due to the rapid cellular division and formation of vital structures. Thus, the emphasis on minimizing radiation exposure during this early stage is crucial for safeguarding fetal health.