To evaluate the serum lactic dehydrogenase (LDH) level as a marker of severity of preeclampsia. Antenatal mothers without complications were taken as controls and women with preeclampsia taken as cases. They were evaluated for serum LDH levels. All enrolled women were followed till delivery and their course of pregnancy and fetal outcome were noted. Mean value of LDH in the control group was 395.16+ 92.54IU/L. The LDH level in non severe type of preeclampsia was 566+ 219IU/L and in severe type of preeclampsia was >600 IU/L where it was highly significant (p<0.001). Antenatal complications and neonatal complications were 25% more in severe preeclampsia where serum LDH levels were >800IU/L. The severity of maternal and fetal complications was correlated well with increased LDH levels in preeclampsia.