Clinical value of prenatal screening markers in early pregnancy combined with perinatal characteristics to predict fetal growth restriction.

Background: Due to the incomplete standardization of the etiology and diagnostic criteria for fetal growth restriction (FGR), there has been uncertainty in the early prediction of FGR. The comprehensive estimation of FGR was mainly based on various factors, such as maternal characteristics and medical history, nuchal translucency (NT), and serum biochemical markers [pregnancy-associated plasma protein-A (PAPP-A) and free beta human chorionic gonadotropin (free β-hCG)]. Herein, we performed a retrospective cohort study to investigate the correlation and diagnostic value of maternal markers such as PAPP-A, free β-hCG, and NT in the first trimester with maternal characteristics, so as to provide theoretical basis for perinatal care and the application of low-dose aspirin.

Methods: A retrospective cohort study was conducted to analyze the data of an FGR group and a non-FGR group. Chi-square test and Mann-Whitney U test were used for univariate analysis of qualitative or quantitative data, respectively. Modified Poisson regression calculated the relative risk (RR) and 95% confidence interval (CI) of perinatal variables; P<0.05 was considered statistically significant.

Results: The multiple of median (MoM) of PAPP-A level and NT in the FGR group were lower than those of the non-FGR group [0.63 (0.12-2.08) vs. 1.01 (0.28-2.41) MoM, 1.30 (0.80-2.07) vs. 1.40 (0.80-2.20) cm, P<0.05]. The weight, score, and length of newborns in the FGR group were lower than those in the non-FGR group (all P<0.001). Modified Poisson regression analysis showed that gestational hypertension (GH) [RR =1.836 (95% CI: 1.188-2.836)], oligohydramnios [1.420 (95% CI: 1.022-1.973)], premature rupture of membranes (PROM) [0.641 (95% CI: 0.425-0.969)], female infant [1.539 (95% CI: 1.098-2.157)], low infant length [5.700 (95% CI: 3.416-9.509)], low birth weight [1.609 (95% CI: 1.012-2.559), and increased PAPP-A MoM [0.533 (95% CI: 0.369-0.769)] were associated with FGR. The cut-off value of PAPP-A + free β-hCG + NT for predicting FGR was 0.190, with a sensitivity of 0.547 and a specificity of 0.778.

Conclusions: Early screening markers combined with perinatal characteristics have better diagnostic value in predicting FGR and provide a scientific basis for the clinical use of low-dose aspirin to prevent FGR.