Objective: The present study aimed to evaluate the vitamin D blood dosage during the three gestational trimesters, while identifying the frequency of pregnant women in the normal range, the variance in the three periods and evaluate the association between vitamin D and the obstetric complications such as preeclampsia, diabetes, and weight of the newborn. Methods: This is a longitudinal study with pregnant and non-pregnant women, from which there was collected data of anamneses, physical exam, obstetric info, as well as milk consumption habits, sunscreen and sun exposure, and also the vitamin D blood dosage. Results: There were 91 Pregnant Women studied, from whom the comparison between the vitamin D dosages identified the absence of gestation as a protective factor for VDD; the tendency for lower levels of supplementations when the workplace is in an external environment; the association between vitamin D and pre-eclampsia in the first trimester. Conclusion: The most relevant consequences from VDD were pre-eclampsia in the first trimester, the absence of gestation as a protective factor for VDD, and the need to consider the workplace before supplementation.
