Main findings
This study shows that 25(OH)D levels in umbilical cord blood are higher
than levels in maternal blood. The correlation between the maternal and
umbilical cord blood is solid and consistent over the range of maternal
levels. Only the supplementation dose significantly impacted the
maternal 25(OH)D level. Low maternal 25(OH)D levels were not associated
with a risk for premature labor, premature rupture of the membranes,
diabetes, or low AS.