DNA twin zygosity test
About the test
Are the twins identical?
A DNA twin zygosity test helps determine whether twins are monozygotic or dizygotic. The laboratory compares the DNA markers of both twins.
The standard service is for two children. Parents' samples are not required to determine zygosity.
Monozygotic twins
They develop when one fertilised egg divides. Their genetic data are very similar.
Dizygotic twins
They develop from two separately fertilised eggs. Genetically, they are as similar as other brothers and sisters with the same biological parents.
What will you receive?
A report comparing the twins' DNA data and giving a conclusion about zygosity. This is not a test for inherited diseases or health status.
From order to result
How does the test work?
Order the test
When you order online, the sample collection kit is provided free of charge.
Collect samples from both twins
Use the supplies intended for each participant and label the samples clearly.
Receive your result
The laboratory will compare the samples and provide a zygosity conclusion.
Documents and instructions
Frequently asked questions
Are parents' samples needed?
They are not needed for the standard twin zygosity test.
Can triplets be tested?
Agree on the scope and price of testing more than two children from the same pregnancy before ordering.
Is paternity or maternity also established?
That is a separate test question. Providing parents' samples does not, by itself, mean that this service is included in the zygosity test.
Can I provide a different type of sample?
Confirm the suitability of an alternative sample before ordering.
When will I receive the result?
Confirm the test turnaround time when ordering.