Maximum dose of radiation exposure during pregnancy is: (A) 0.5 rad, (B) 1 rad, (C) 1.5 rad, (D) 5 rad
Answer is D. The biological effects of x-rays are caused by an electrochemical reaction that can damage tissue. Embryo-fetal risks from low-dose diagnostic radiation appear to be minimal. Current evidence suggests that there are no increased risks for malformations, growth restriction, or aboion from a radiation dose of less than 0.05 Gy (5 rad). Reference: William&;s Obstetrics; 24th edition; Chapter 46; General Considerations and Maternal Evaluation