OBJECTIVE: To determine in a group of pregnant women if vitamin D status, based on serum 25-hydroxyvitamin D (25OHD) concentration, was associated with a subsequent risk of pre-eclampsia or adverse pregnancy outcomes. DESIGN: Prospective cohort study. SETTING: Vancouver, British Columbia, Canada (49 degrees N). POPULATION: Women attending a specialist antenatal clinic because of clinical or biochemical risk factors for pre-eclampsia (n = 221). METHODS: Serum 25OHD concentration measured between 10 and 20 weeks of gestation. MAIN OUTCOME MEASURES: Pre-eclampsia and composite adverse pregnancy outcomes. RESULTS: Of the women, 78% were vitamin D insufficient (25OHD <75 nmol/l) and 53% were vitamin D deficient (25OHD <50 nmol/l). There was no difference in the rates of pre-eclampsia, gestational hypertension, preterm birth or composite adverse pregnancy outcomes by 25OHD concentration. CONCLUSIONS: Vitamin D deficiency and insufficiency were common in a group of women at high risk of pre-eclampsia; however, it was not associated with subsequent risk of an adverse pregnancy outcome.
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