Retrospective analysis of 4761 cases who underwent amniocentesis in southeast China.

The aim of this study was to examine the clinical and cytogenetic results of 4761 amniocentesis (AS) cases retrospectively in our clinic in southeast China. The prenatal diagnosis indications, detected chromosomal anomalies and the detection rate of chromosomal abnormalities were studied in 4761 patients who underwent AS between June 2014 and July 2016 retrospectively. Chromosomal abnormality was detected in 137 (2.88%) of the 4761 samples (89.1% numerical, 10.9% structural). The most frequent numerical chromosomal abnormality was trisomy 21 (59.0%). Clinically insignificant polymorphisms were the most frequent structural changes (n = 284). In our study, the frequency and proportion of abnormal karyotypes varied substantially across different maternal AS indications. Impact statement What is already known on this subject: Several studies on amniocentesis indications and results have been reported from China and from other countries. It has been known that the most common indications were the increased risk at maternal serum screenings (MSS) and advanced maternal age (AMA). What the results of this study add: In our study we make a conclusion that the indications and results of AS cases from our centre indicated the significance of genetic screening. What the implications are of these findings for clinical practice and/or further research: Our data could offer informative data for proper prenatal genetic counselling of pregnant women and their partners in Wuxi, China.