Obtaining adequate vitamin D during pregnancy is important for the health of mother and child. Low circulating 25-hydroxyvitamin D (25OHD) concentrations, a measure of vitamin D status, have been reported in pregnant women in several countries; yet, there are few studies of pregnant Canadian women. We measured 25OHD concentrations in a multi-ethnic group of pregnant women living in Vancouver (49 degrees N) and explored the determinants of 25OHD.
336 pregnant women (16-47 y) between 20 and 35 weeks gestation provided a blood sample and completed questionnaires.
Mean 25OHD was 67 (95% CI 64-69) nmol/L. Only 1% of women had a 25OHD concentration indicative of severe deficiency ( or = 400 IU/d. However, 24% and 65% of these women had 25OHD