Finally, the diagnostic criteria for severe preeclampsia were compared. Rates of HELLP(hemolysis-elevated liver enzymes low platelet count), abruption, eclampsia and fetal criteria were similar between singleton and twin gestations. Women with a twin gestation were more likely to be diagnosed with severe preeclampsia based on lab abnormalities alone (12%vs3%,P¼0.002). All other categories of diagnostic criteria were simila lr between twins and singletons.