Identical/fraternal twin
Twin test
A DNA test can determine whether twins are identical or fraternal. The same applies to triplets.
Twin Testing
Identical (Monozygotic) Twins
Identical twins develop from a single fertilised egg that splits and forms two separate embryos. As a result, they share virtually identical DNA.
Identical twins:
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Always have the same sex
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Typically have a very similar physical appearance
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Share the same genetic profile (with rare exceptions due to spontaneous mutations)
Fraternal (Dizygotic) Twins
Fraternal twins develop from two separate egg cells, each fertilised by a different sperm cell. Genetically, they are similar to ordinary siblings.
Fraternal twins:
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Share approximately 50% of their DNA, like other siblings
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May be of the same or different sexes
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May, in rare cases, have different biological fathers (if two egg cells are fertilised by sperm from two different men)
Consent Requirements
All participants in a twin test must provide informed consent.
For children under 15 years of age, consent must be given by a parent with parental responsibility.
Order a Twin Test
Price: NOK 1,750 per person
Order Form: Order Twin Test from OUS (PDF)
Questions?
Please contact the us for further information and guidance.