The extract etiology for preclampsia is yet to be elucidated. One of the theory of regarding the cause preclampsia is placental ischaemia, which decreases enzim of 1 alfa hydroxilase production. In preclampsia, the level of serum calcitriol is reduced, due to the reduced level of 1 alfa hydroxilaseenzime, and thus lowering the excretion rate of urinary calsium. Study design observational descri…