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Insufficient Vitamin D Linked to Miscarriage Among Women with Prior Pregnancy Loss

News Release

Wednesday, May 30, 2018

NIH study suggests the importance of preconception vitamin D in maintaining pregnancy.

Among women planning to conceive after a pregnancy loss, those who had sufficient levels of vitamin D were more likely to become pregnant and have a live birth, compared to women with insufficient levels of the vitamin, according to an analysis by researchers at the National Institutes of Health. This study appears in The Lancet Diabetes & Endocrinology.

“Our findings suggest that vitamin D may play a protective role in pregnancy,” said the study’s principal investigator Sunni L. Mumford, Ph.D., in the Epidemiology Branch of the Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD).

The authors note that a few studies have shown that women who have higher levels of vitamin D before undergoing in vitro fertilization have higher pregnancy rates than those with lower levels. However, little research has been done on pregnancy rates & pregnancy loss in women attempting to conceive without assisted reproductive technologies.

The researchers analyzed data collected as part of the Effects of Aspirin in Gestation and Reproduction (EAGeR) trial, which sought to determine if daily low-dose aspirin (81 milligrams) could prevent miscarriage in women with a history of pregnancy loss. Blood levels of vitamin D were tested for roughly 1,200 women before pregnancy & again at the eighth week of pregnancy. Researchers defined a vitamin D level of below 30 nanograms per milliliter as insufficient.

Women who had sufficient preconception vitamin D concentrations were 10 percent more likely to become pregnant & 15 percent more likely to have a live birth, compared to those with insufficient concentrations of the vitamin. Among women who became pregnant, each 10 nanogram per milliliter increase in preconception vitamin D was associated with a 12-percent lower risk of pregnancy loss. Vitamin D levels in the eighth week of pregnancy were not linked to pregnancy loss.

The authors note that the study does not prove cause & effect. Additional studies are needed to determine whether providing vitamin D to women at risk for pregnancy loss could increase their chances for pregnancy and live birth.

About the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD): NICHD conducts & supports research in the United States and throughout the globe on fetal, infant & child development; maternal, child and family health; reproductive biology & population issues; & medical rehabilitation. For more information, visit https://www.nichd.nih.gov.

About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes & Centers & is a component of the U.S. Department of Health & Human Services. NIH is the primary federal agency conducting & supporting basic, clinical, & translational medical research, & is investigating the causes, treatments, & cures for both common & rare diseases. For more information about NIH and its programs, visit www.nih.gov.

NIH…Turning Discovery Into Health®

Reference

Mumford, SL, et al. Association of preconception serum 25-hydroxyvitamin D concentrations with livebirth & pregnancy loss: a prospective cohort study. The Lancet Diabetes & Endocrinology. http://dx.doi.org/10.1016/S2213-8587

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Source: nih.gov

Updated: May 31, 2018 — 7:45 pm

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