
This systematic review aimed to assess the screening performance of non-invasive prenatal testing (NIPT) in pregnancies with a vanishing twin. Seven studies were included, with varying cohort sizes. The pooled data showed a screen positive rate of 2.2% for trisomy 21, 0.91% for trisomy 18, and 0.44% for trisomy 13. The positive predictive values (PPVs) were 20%, 25%, and 0% for trisomy 21, trisomy 18, and trisomy 13, respectively. Additional findings had a screen positive rate of 2.9%, but none could be confirmed. While NIPT appears capable of detecting common autosomal aneuploidies in pregnancies with a vanishing twin, further research is needed to determine optimal timing and improve accurac
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