Suspicion of a chromosome abnormality is typically raised due to the presence of developmental delays or birth defects. Diagnosis of<unk>  is usually made from a blood sample. A routine chromosome analysis, or karyotype, is usually used to make the initial diagnosis, although it may also be made by microarray analysis. Increasingly, microarray analysis is also being used to clarify breakpoints. Prenatal diagnosis is possible using amniocentesis or chorionic villus sampling.
Distal 18q-
Dup15q
Xq28
Ring chromosome 18
Ring chromosome 15
714-X
Ring chromosome 22
18p-