title: Women's compliance with current folic acid recommendations and achievement of optimal vitamin status for preventing neural tube defects.
abstract: BACKGROUND
  The timing of folic acid supplement usage is critical to preventing pregnancies affected by neural tube defects (NTDs) because the neural tube closes by Day 28 post-conception. We investigated compliance of pregnant women with current folic acid recommendations (400 µg/day from preconception to 12 weeks) in relation to achieving a folate status associated with lowest risk of NTDs.
  
  
  METHODS
  From a sample of 296 women with singleton uncomplicated pregnancies attending an antenatal clinic in Northern Ireland, those who reported taking folic acid in the first trimester (n = 226) were investigated. Samples were taken at 14 weeks gestation to measure serum concentrations of folate and vitamin B12 (related to folate and an independent predictor of NTD), and dietary B-vitamin intake and folic acid usage were investigated.
  
  
  RESULTS
  Although the majority of the overall sample (84%) reported taking folic acid supplements in the first trimester, only 19% had started before conception, as recommended. Multigravidae compared with primigravidae women were less likely to have followed the recommendations correctly (P= 0.001). At 14 weeks, red cell folate (considered a reliable biomarker of previous 3 months, covering time of neural tube closure) was correlated (r = 0.320, P < 0.001) with the reported duration of folic acid usage, and was lower (P< 0.0001) in women who started folic acid after conception.
  
  
  CONCLUSIONS
  Red cell folate concentrations in women not complying with recommendations were suboptimal in relation to NTD risk. The findings generally support the recent official recommendation to the Chief Medical Officer for mandatory fortification of food with folic acid in the UK.
authors: Northern Ireland Centre for Food & Health, University of Ulster, Coleraine, Northern Ireland BT52 1SA, UK.
authors: Breige
authors: B
authors: McNulty
authors: Kristina
authors: K
authors: Pentieva
authors: Barry
authors: B
authors: Marshall
authors: Mary
authors: M
authors: Ward
authors: Anne M
authors: AM
authors: Molloy
authors: John M
authors: JM
authors: Scott
authors: Helene
authors: H
authors: McNulty
mesh_terms: D000328:Adult; D019587:Dietary Supplements; D005260:Female; D005492:Folic Acid / Q000097:blood*; D005527:Food, Fortified; D006801:Humans; D009436:Neural Tube Defects / Q000517:prevention & control*; D010349:Patient Compliance; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011295:Prenatal Care; D014805:Vitamin B 12 / Q000097:blood
chemical_list: D005492:Folic Acid; D014805:Vitamin B 12