title: Screening for chromosomal abnormalities.
mesh_terms: D002869:Chromosome Aberrations / Q000175:diagnosis*; D025063:Chromosome Disorders; D004314:Down Syndrome / Q000175:diagnosis / Q000517:prevention & control; D004992:Ethics, Medical; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012732:Sex Determination Analysis