months into her pregnancy. she fears she's about to lose her unborn baby to a miscarriage. she's waiting in a hospital room when a nurse comes in and asks if her name is carrie. carrie says yes and follows the nurse to a ct scan room. the nurse tells carrie a doctor wants a scan of her abdomen, and they give her the scan, even though carrie is three months pregnant. >> if you're radiating the abdomen, by definition the baby is going to be in the field of radiation and the baby's going to get radiated. >> that ct scan is a mistake. the hospital has confused carrie with another patient named carrie. >> the scan on the pregnant woman will increase the risk that that child will get leukemia. at that early stage in gestation the fetus is also at risk of getting birth defects. >> fortunately, carrie's son nathan is doing just fine. >> how do they confuse patients? >> it often happens with people who have similar names.