title: Vitamin D status during normal pregnancy and postpartum. A longitudinal study in 141 Danish women.
abstract: OBJECTIVE
  To assess vitamin D status during normal pregnancy and in the postpartum lactation period.
  
  
  METHODS
  The study comprised 141 healthy, ethnic Danish women with normal pregnancies, who were residents in Greater Copenhagen. Serum 25-hydroxy-vitamin D2+D3(25-OH-vitamin D) was measured at 18, 32 and 39 weeks' gestation and 8 weeks postpartum.
  
  
  RESULTS
  There was a significant increase in 25-OH-vitamin D from 18 to 32 weeks' gestation (P=0.0001) followed by a significant decrease from 32 to 39 weeks (P=0.001) as well as from 39 weeks to 8 weeks postpartum (P<0.0001). At 18, 32, 39 weeks' gestation and 8 weeks postpartum, median 25-OH-vitamin D values were 77, 98, 91, and 73 nmol/L, respectively. During pregnancy and postpartum, none of the women displayed severe vitamin D deficiency (values <13 nmol/L). Between 1.4% and 4.3% of the participants displayed moderate vitamin D deficiency (values 13-24 nmol/L), 16-19% displayed vitamin D insufficiency (values 25-50 nmol/L), 77-84% had values >50 nmol/L and 0.7-2.8% had values >200 nmol/L.
  
  
  CONCLUSIONS
  Low vitamin D status is frequent among pregnant Danish women, especially in late pregnancy and during lactation. Median dietary intake of vitamin D in women of reproductive age was 2.4 μg/day (10-90 percentile range=1.4-5.0). The recommendations for vitamin D supplementation prior to conception, during pregnancy and lactation should be reconsidered.
authors.affiliation: Department of Obstetrics and Gynecology, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark. nils.mil@dadlnet.dk
authors.forename: Nils
authors.initials: N
authors.lastname: Milman
authors.forename: Anne-Mette
authors.initials: AM
authors.lastname: Hvas
authors.forename: Thomas
authors.initials: T
authors.lastname: Bergholt
mesh_terms: D000328:Adult; D003718:Denmark; D005260:Female; D006801:Humans; D007774:Lactation / Q000097:blood; D008137:Longitudinal Studies; D049590:Postpartum Period / Q000097:blood*; D011247:Pregnancy / Q000097:blood*; D014807:Vitamin D / Q000097:blood*
chemical_list: D014807:Vitamin D