Genetic variability and number of outside stressors have been investigated in autism and a class of genetic disorders.
Researchers at UW Medicine, UW Bothell and Seattle Children's research institute have found a link between diagnostic ultrasound in the first trimester of pregnancy and increase autism severity.
Ultrasound in the second and third trimester showed no such link.
This study strengthens the FDA guidelines which recommend that diagnostic ultrasound should only be used for medical necessity.
