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for rapid determination of zygosity and exclusion of UPD under such a circumstance. V.OBJECTIVE We present prenatal diagnosis low-level mosaic trisomy 17 with maternal uniparental disomy (UPD) 17 at amniocentesis in a pregnancy with a favorable outcome. MATERIALS AND METHODS A 40-year-old, primigravid woman underwent amniocentesis at 18 weeks of gestation because of advanced maternal age. This pregnancy was conceived by in vitro fertilization and embryo transfer. Amniocentesis revealed a karyotype of 47,XX,+17 [13]/ 46, XX [23]. Repeat a