Down Syndrome: Prenatal Risk Assessment and Diagnosis - American Family Physician
Aug 15, 2000 - Down syndrome (trisomy 21) is the most commonly recognized genetic cause of mental retardation. The risk of trisomy 21 is directly related to maternal age. All forms of prenatal testing for Down syndrome must be voluntary. A nondirective approach should be used when presenting patients ...
American Family Physician : Article
https://www.aafp.org/afp/2000/0815/p825.html
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