Introduction: Vitamin D is known as nourishment and prohormone, that is important for muscle-skeleton health and immune system. Problems that occur with vitamin D deficiency were already presented in the past. Today vitamin D importance is growing with new researches and clinical trials. Vitamin D deficiency in pregnancy has shown a negative effect on neonatal and maternal outcomes. Purpose: The purpose is to overview recommendations made by world know health organisations and to find out what is status of vitamin D in pregnant woman living in Slovenia. Methods: We used descriptive work methods. We searched scientific literature in Slovenian and English language. Scientific and professional literature was found in electronic databases PubMed, Cochrane Library, Chinal and Science Direct. Nine clinical researches were included. Qualitative meta synthesis of literature was made about reaching different concentration of vitamin D with adding vitamin D in different doses daily. At the end of diploma, is interview with doc. Dovnik. He did a trial about vitamin D concentration in women and new-borns in Maribor. Results: World health organizations recommendations are from 200 to 800 iu a day. Slovenia is a country where vitamin D deficiency is very common. Research show that in 2015, 55 % of pregnant women in Slovenia was vitamin D deficient and in 2016 deficiency was found in 65.1 % of pregnant women in Slovenia. Worldwide research shown that adding 400 iu a day was not efficient in pregnant women, who had vitamin D deficiency. It also shown that adding vitamin D in pregnancy to 4000 iu daily was safe. Discussion and conclusion: World health organisations recommendations are treating pregnant women same as adults, even though metabolism and needs are not the same. Because of proven positive effect on maternal immunity in times of Covid-19. Slovenia should recommend adding vitamin D in pregnancy.
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