Karyotype Analysis

CHROMOSOMAL ABNORMALITY	CONDITION
Trisomy 21	Down syndrome
Trisomy 18	Edward syndrome
Trisomy 12	Patau syndrome
45, XO	Turner syndrome
47, XXY	Klinefelter syndrome
47, XXX	Triple X syndrome
47, XXY	Associated with behavioural problems
5p–	Cri-du-chat syndrome
Microdeletion at 22q11	DiGeorge syndrome
Microdeletion at 7q11	Williams syndrome