title: 550 cases of prenatal cytogenetic diagnosis: experience and prospects.
mesh_terms: D000328:Adult; D000649:Amniocentesis; D000653:Amniotic Fluid / Q000166:cytology*; D003581:Cytodiagnosis; D005260:Female; D006801:Humans; D007621:Karyotyping; D008423:Maternal Age; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*