Twin Zygosity Testing

The decision on whether twins are fraternal or identical is usually based on the Doctor's examination of the placenta after delivery but this method is not always completely reliable. Now, we can perform a simple DNA test on twins (Identical Twin Test) by collecting loose DNA cells from the inside of the cheek using a buccal swab. This is a painless procedure that can be easily administered on infants as well as adults. The DNA sample is analyzed and produces the donor's genetic profile. If the twins are monozygotic (identical), their genetic profiles will be exactly the same and if the twins are dizygotic (fraternal), their genetic profiles will be different. It is therefore possible to determine with 99% certainty whether twins are identical or fraternal. 

Fast & Convenient

Our self-administered buccal swab sample collection kit can be mailed to your home and after the samples are collected and returned to our lab for analysis, results can usually be obtained within 10 days.


All tests must be pre-paid in advanced and included with the return of the samples to our laboratory. We accept Visa, MasterCard, certified cheque and money orders.

For your free case consultation call toll-free: 1-866-DNA-LABS