Sonja is 42 years old and pregnant with her first child. Her doctor thinks she ought to have a procedure called amniocentesis to harvest fetal cells for genetic analysis. He tells Sonja that he will use a large needle inserted through her abdomen to obtain these cells from the amniotic fluid around the baby. He tells her that he will be able to visualize the needle so she needn’t worry about sticking her baby. She decides that she still thinks it is dangerous because of the radioactivity her baby will be exposed to. Need she be concerned?