Yes, you can call it Trisomy 21 or DS.
The abbreviation for Toxic Shock Syndrome is TSS. Abbreviation means a shortened form of a word or a phrase, often using the first letters of the words in the phrase; Toxic Shock Syndrome: TSS.
IBS
hiv
It stands for "Irritable Bowel Syndrome".It stands for irritable bowel syndrome
down syndrome
acute respiratory distress syndrome
CFS
Guillain Barre Syndrome
Disorders, such as Down's Syndrome, are caused by nondisjunction.
Down syndrome is generally the preferred spelling, although Down's syndrome is sometimes used in American sources.
Most cases of down syndrome are not inherited. Translocation Down syndrome can be inherited.
Down syndrome IS the diagnosis.