Circulating endothelial progenitor cells (EPCs), which help repair damaged blood vessels, were found to be significantly higher in both obese pregnant women and mice compared to their lean counterparts. EPCs levels were measured in the first trimester of pregnancy using flow cytometry and were elevated across multiple EPC subtypes in obese subjects. While pregnancy itself increases EPCs, obesity appears to further elevate EPC levels during pregnancy, though it remains unclear if these additional EPCs function properly.