BACKGROUND Hypertension during pregnancy is a major health problem. Hypertensive disorders of pregnancy (preeclampsia, eclampsia) are common medical complications and affect 10% pregnancies. These pregnancies are at increased risk for maternal complications like abruption, disseminated intravascular coagulation, HELLP syndrome, pulmonary oedema, stroke, hepatic failure and renal failure. Foetal complications include growth restriction, prematurity and death of foetus. Early screening of gestational hypertension and preeclampsia may reduce the maternal and foetal complications. METHODS We conducted this study of levels of LDH in normotensive pregnancy, preeclampsia and eclampsia. This is a hospital based comparative cross-sectional study conducted in the department of Obstetrics & Gynaecology, Bharati Vidyapeeth Medical College and Hospital, Sangli, from December 2015 to July 2017. Out of a total of 150 patients included in present study, 50 patients were in normotensive group, 50 in preeclampsia group and 50 were in eclampsia group. Along with blood investigations, LDH levels were studied in all three groups. RESULTS Mean LDH was 257.24 U/L in normotensive patients as compared to 417.84 U/L in patients with pre-eclampsia and 565.51 in patients with eclampsia. LDH levels were found to be raised in pre-eclampsia and eclampsia patients and was statistically significant. CONCLUSIONS Serum LDH is the earliest marker in blood during hypoxia and oxidative stress. It is raised in cases of pre-eclampsia and eclampsia. Detection of high-risk patients with increased levels of LDH mandates close monitoring, prompt and correct management to decrease both maternal and foetal morbidity and mortality. Estimation of serum Lactate Dehydrogenase can be used as a prognostic marker for preeclampsia and eclampsia.