Down Syndrome Test Name. It's called the combined test because it combines an ultrasound scan with a blood test. Diagnostic testing for down syndrome involves removing a sample of genetic material.
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The average iq of a young adult with down syndrome is 50, equivalent to the mental ability of an. Approximately one ounce of fluid is taken for testing. It is a genetic condition resulting when a baby is born with three rather than the typical two copies of chromosome 21.