The positive predictive values of cell free DNA (cfDNA) and rates of confined placental mosaicism (CPM), imprinting and other factors vary by chromosome.

中文翻译：

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无细胞 DNA 筛查呈阳性结果后的诊断测试：CVS 还是 Amnio？

游离 DNA (cfDNA) 的阳性预测值和胎盘嵌合率 (CPM)、印记和其他因素因染色体而异。