Cytogenetics Laboratory
Incidence of Chromosome Abnormalities at Birth
   A Joint Venture of London Health Sciences Centre and St. Joseph's Health Care London

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Sex Chromsome Aneuploidy
47,XXY 1/1000 Male Births
47,XYY 1/1000 Male Births
47,XXX 1/1000 Female Births
45,X 1/10 000 Female Births



Autosomal Aneuploidy
Trisomy 21 1/800
Trisomy 18 1/8000
Trisomy 13 1/20 000
Triploidy 1/60 000


Structural Abnormalities
Balanced Robertsonian 1/1000
Balanced Reciprocal 1.5/1000
Balanced Inversions 1/1000
Unbalanced 1.5/1000
Microdeletion Syndromes 1/1000-2000
Total 1%

 

 

 

 

  Revised: April 1, 2003
Maintained by: Janice Little