Abstract
Low levels of plasmatic pregnancy-associated plasma protein-A (PAPP-A) and high levels of free-beta human chorionic gonadotropin (beta-hCG) could influence the outcome of pregnancy. The objective of this study is to assess the correlation between PAPP-A and free beta-hCG and birth weight. Prospective follow-up study performed on 3332 patients in the first trimester of pregnancy who were subjected to a screening test focused on evaluation of fetal aneuploidy (SCA-TEST). The values of PAPP-A and free beta-hCG were both analyzed as raw values and subsequently converted to a multiple of the median (MoM). Statistical analysis was performed using SPSS version 17.0.1 (SPSS Inc., Chicago, USA). The incidence of "small for gestational age" in patients with PAPP-A MoM<1st and <5th‰ was statistically significant (12 and 9.8%; p<0.0001). Also statistically significant data have been highlighted about free beta MoM>95th‰ (7%; p=0.03). The values of PAPP-A MoM>99th‰ are significantly correlated with an increased risk of "large for gestational age" (16.7%; p<0.0001). Our study demonstrates that specific values of PAPP-A and free beta-hCG could identify the risk of low or high birth weight since the first trimester of pregnancy.
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