Service detail
Twin zygosity test
Type
Personal
Turnaround time
3–5 business days
Price
From $159
Our twin zygosity test determines whether twins developed from one egg (identical) or two separate eggs (fraternal). A fascinating insight into your family's biology.
What is a twin zygosity test?
A twin zygosity test analyzes the DNA of twins to determine whether they are monozygotic (identical, from one fertilized egg) or dizygotic (fraternal, from two separate eggs).
Why test?
Satisfy lifelong curiosity about your twin relationship
Medical necessity: identical twins share the same blood type and organ compatibility
Important for potential organ or bone marrow donation
Family history documentation
How it works
Order your kit
Collect buccal swabs from both twins
Return samples in the prepaid envelope
Receive results in 3–5 business days
Accuracy
Twin zygosity tests are 99.9% accurate in determining whether twins are identical or fraternal.
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