Introduction: Preeclampsia is a pregnancy-specific multi-systemic disorder characterized by proteinuria and the onset of hypertension during pregnancy (1, 2) Among the hypertensive disorders that complicate pregnancy, pre-eclampsia and eclampsia stand out as major causes of maternal and perinatal mortality and morbidity3. Calcium has an important role in the pathogenesis of pre- eclampsia. The present study was aimed to compare the level of serum calcium in normal pregnant women and in preeclampsia and determine the association of serum calcium with severity of the disease