Vitamin D deficiency is common among certain risk groups in Sweden, and occurs approximately in every tenth pregnant woman.The aim of the randomized double-blind controlled trial Pregnancy vitamin D intervention (PREDIN) is to investigate the dose of vitamin D supplementation required in achieving vitamin D sufficiency (25OHD ≥50 nmol/l) in pregnant women at risk of vitamin D deficiency. In addition, the investigators aim to examine if the overall vitamin D status and vitamin D intake have increased since the expanded vitamin D fortification program was initiated in year 2020.
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Difference in maternal vitamin D status (25OHD) between intake of vitamin D supplements containing either 40 µg per day or 20 µg per day during pregnancy
Timeframe: From inclusion in first trimester to follow-up in third trimester, up to 9 months
Difference in maternal vitamin D status (25OHD) between intake of vitamin D supplements (both 40 µg per day or 20 µg per day) during pregnancy and usual antenatal care routines
Timeframe: From inclusion in first trimester to follow-up in third trimester, up to 9 months
Difference in maternal 3-epi-25-Hydroxyvitamin D between the three groups; intakes of vitamin D supplements 40 µg/day or 20 µg/day or usual antenatal care routines
Timeframe: From inclusion in first trimester to follow-up in third trimester, up to 9 months
Difference in maternal 1,25-dihydroxyvitamin D between the three groups; intakes of vitamin D supplements 40 µg/day or 20 µg/day or usual antenatal care routines
Timeframe: From inclusion in first trimester to follow-up in third trimester, up to 9 months
Difference in maternal vitamin D binding proteins between the three groups; intakes of vitamin D supplements 40 µg/day or 20 µg/day or usual antenatal care routines
Timeframe: From inclusion in first trimester to follow-up in third trimester, up to 9 months