SGA is associated with higher incidence of postnatal complications, including suboptimal neurodevelopment and increased cardiovascular risk. Screening for SGA, carried out at 11-13 (+ 6d) gestational weeks enables to reduce or completely eliminate the above mentioned complications. The aim of this study was to assess the correlation between chorionic thickness, concentration of PIGF protein and foetal birth weight in a single low-risk pregnancy.


The study included 76 patients at 11-13 (+ 6d) gestational weeks, monitored throughout preg-nancy. Ultrasound examinations identified the location and thickness of the chorion by measuring it in its central part at its widest point in a sagittal section. Additionally, at each visit venous blood was collected to determine the level of PlGF, PAPP-A, and BhCG.


A significant positive correlation (r = 0.37) was found between the foetal weight and chorionic thickness. This correlation was affected by the location of the chorion and a significant negative correlation was observed between the level of PLGF, FHR, weight and length of the newborn. Maternal early-pregnancy BMI did not affect neonatal weight and body length, FHR, chorionic thickness, and the levels of PlGF, PAPP-A, and BhCG.


The preliminary analysis indicates an association between chorionic thickness assessed during ultrasound at 11-13 (+ 6d) gestational weeks, PIGF levels assayed at the same time and birth weight. Increasing chorion thickness was accompanied by increasing foetal birth weight. PlGF level showed an inversely proportional effect on the foetal weight. This correlation was significant for the posterior location of the chorion.


SGA; chorion thickness; newborn birth weight; ultrasound