Down Syndrome Diagnosis (Cont.)

Diagnosing Down Syndrome With Blood Tests

To confirm the Down syndrome diagnosis, the doctor may request a blood test called a chromosomal karyotype, which looks at a person's chromosomes. The karyotype of a person with Down syndrome will have an extra chromosome 21 (see Causes of Down Syndrome).
 
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Written by/reviewed by: Arthur Schoenstadt, MD
Last reviewed by: Arthur Schoenstadt, MD