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Introduction. The etiology of embryonic demise is multifactorial, with chromosomal abnormalities being the most common (60%). The purpose of this study is to evaluate the correlation between a serum biomarker, placental growth factor (PlGF), and an ultrasonographic parameter, the distance between yolk sac (YS) and embryo (DYSE), in assessing the prognosis of pregnancy evolutivity in the first trimester. Method. The study is a case-control prospective analysis that includes two groups of patients: 81 patients with first-trimester pregnancy in evolution, and 89 patients with embryonic demise, all of the patients having amenorrhea between 6 and 11 weeks. The endovaginal ultrasonographic exploration was performed to evaluate the distance between the lower pole of the embryo and the yolk sac. From each subject enrolled in the study, 20 ml of blood was collected for PlGF dosing. Results. Regarding the DYSE in the case group, lower values were observed compared to the control group, the difference being statistically significant. In the statistical analysis of serum PlGF values, statistically significant differences were observed between the two groups (p<0.0001). Conclusions. DYSE has a high positive predictive value in identifying pregnancies with potentially reserved evolutivity, this study demonstrating that a DYSE<3 mm may lead to an unfavorable evolution of pregnancy. The low serum level of PlGF is associated with an increased rate of nonviable embryos. [ABSTRACT FROM AUTHOR]