To study the D dimer levels as a predictor of severity of gestational hypertension. Methodology: A Prospective observational study was performed among the Antenatal women attending the Department of Obstetrics and Gynaecology in our institution. Blood samples were collected from 150 subjects under inclusion criteria and the D Dimer levels were estimated and the same was compared with the severity of the disease. Patients who were COVID positive and who had past history of thrombotic manifestations were excluded from the study. Results: In about 54% of the subjects evaluated, the D Dimer concentrations exceeded the normal range of more than 500 ng/dl. Higher concentrations of D Dimer levels were noted in patients with severe preeclampsia than in those with non-severe preeclampsia. Conclusion: Maternal concentrations of D Dimer were significantly elevated in patients with severe preeclampsia than in those with non-severe disease.