Can an ultrasound detect gastroschisis or an omphalocele?

Ultrasound: most of the times diagnosis is made prenatally, few times it is difficult to differentiate between the two based on ultrasound

Depends: The ability to find things on an ultrasound is often dependent on the type of equipment and the skills of the sonographer. In some settings they don't look for more than the BPD or head size to verify timing of pregnancy. If the study is done for prenatal diagnosis it is more detailed & should pick it up.