Blood Clues Reveal Early Birth Risks

Analysis of pregnant women's blood samples reveals molecular distinctions between pregnancies ending early and those concluding pre-term, with some indicators emerging in the first trimester.

These findings suggest that maternal blood markers could help predict the likelihood of a pregnancy concluding pre-term, early-term, or at full term. Pre-term births, before 37 weeks, and early-term births, at 37-38 weeks, can have significant, lasting health consequences for newborns.

The study, published in Nature Health, examined over 500 pregnant women, collecting serum in early (8-14 weeks) and later (24-30 weeks) pregnancy. Metabolome-wide association studies were employed to correlate metabolites with health outcomes.

Distinct metabolic profiles differentiated spontaneous and medically indicated pre-term and early-term births across pregnancy windows. Spontaneous early births showed differences in amino acids, crucial for fetal growth and stress response. Medically indicated early births were associated with molecular signs related to the body's energy use and stress responses.

Specifically, changes in amino acids like valine, leucine, and tyrosine were linked to spontaneous early births. Conversely, metabolites such as acylcarnitine and the hormone aldosterone were associated with medically indicated early births, highlighting different pathways for each scenario.