Direct antiglobulin (direct Coombs’) test is used to detect antibodies - Nausea and vomiting during the first trimester of pregnancy

- Direct antiglobulin (direct Coombs’) test is used to detect maternal antibodies attached to red blood cells in the neonate.

- Nausea and vomiting during the first trimester of pregnancy are caused by rising levels of the hormone human chorionic gonadotropin.