Zygosity testing


Molecular analysis of polymorphic markers can be used for �DNA fingerprinting� to determine the zygosity of twins. Monozygotic (identical) twins will inherit the same alleles from their parents for all of the markers tested, whereas dizygotic twins are likely to inherit different alleles (but they may inherit the same alleles by chance).

Request a test

When requesting this test please use the referral form provided. Please also refer to any additional information provided for this test.

Additional information

For additional information please click on the link

Sending address

Rare & Inherited Disease Laboratory
London North Genomic Laboratory Hub
Great Ormond Street Hospital for Children
Levels 4-6 Barclay House
37 Queen Square

Laboratory service


Sample requirements

1ml EDTA neonates, 5ml EDTA adults

Reference range

Not applicable

Turnaround time

20 days


Upon request

Call in advance?

Not required


The Genetics Laboratories provide an extensive range of Cytogenetics and Molecular Genetics diagnostic testing services.

© 2011 Great Ormond Street Hospital for Children NHS Trust