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Presentation date

Summer 8-12-2021

College, Institute, or Department

MD-PhD Scholars Program

Faculty Mentor

Ann Anderson-Berry, MD, PhD

Research Mentor

Matt VanOrmer, Melissa Thoene, Maranda Thompson, Rebecca Slotkowski, Corrine Hanson


Background: Vitamin D deficiency associated with lower 25-hydroxyvitamin D (25(OH)D) concentration is common among individuals with more melanin pigmentation. Low 25(OH)D levels in pregnant women may be related to increased risk of low birth weight and preterm delivery. Still, few studies have assessed how serum levels of 25(OH)D vary between maternal and infant race/ethnicity.

Objective: This study aimed to investigate the relationship between 25(OH)D levels in maternal blood and infant cord blood within certain ethnic groups, prematurity status, and low birth weight.

Experimental Design:An IRB-approved study enrolled 86 mother-infant pairs. Maternal blood samples and infant cord blood samples were analyzed for 25(OH)D serum levels. Descriptive statistics and Kruskal-Willis tests comparisons were conducted with the use of IBM SPSS Statistics 28 software to assess the relationship between maternal and cord blood 25(OH)D levels in other race/ethnicity groups, birthweight, and preterm birth. Prematurity was categorized into two groups: premature (weeks) and term (≥37 weeks). Birth weight was categorized into two groups: low birth weight (< 2500 g weeks) and not low birth weight (≥2500 g weeks). A p-value of

Results:Median levels of 25(OH)D serum were lower in infant’s cord blood (22.52 ng/mL) than maternal blood (38.06 ng/mL). White participants had significantly higher 25(OH)D levels than African American participants in both maternal blood (40.76 ng/mL vs 27.79, p =

Conclusion: Our findings suggest a possible association with lower serum 25-hydroxyvitamin D concentration in darker skin pigmentation, even in a small sample size. These results suggest that prematurity and birth weight should be replicated in larger sample sizes of different Race/Ethnic groups, limiting this finding. Further studies should focus on examining differences with larger and more diverse sample sizes. Such research should include measuring Vitamin D intake in pregnancy and clinical outcomes.


vitamin D, 25-hydroxyvitamin D, pregnancy, infancy, ethnicity, Low birth weight, Preterm delivery

Differences in Maternal and Infant Cord Blood Vitamin D Between Racial/Ethnic Groups