How are twins conceived?

Identical twins result when a single sperm cell fertilizes a single ovum and the egg then splits into 2, forming 2 separate embryos which are genetically carbon copies of each other. Non Identical twins result when two ova are fertilized independently by 2 independent sperm cells forming 2 embryos with different genetic makeups.

Our twin DNA test can confirm whether the DNA profiles of the test participants are identical (proving they are identical twins) or whether their DNA profiles are different (proving they are non-identical twins).

Twin DNA testing kit

Our home kit will enable you to collect DNA samples using mouth swabs. The kit will contain the instructions, consent forms and pre-addressed envelope. Both twins need to be sampled by rubbing the swabs inside the mouth and under the tongue and then left to dry. You will then return the swabs for laboratory analysis. Click here for more info.

Why carry out a twin DNA test?

  • Because looking at resemblance and the physical characteristics between twins is not always a clear way of knowing if twins are monozygotic or dizygotic. Non-identical twins can look so similar that they could be thought to be identical.
  • Identical twins will have the same blood groups; they can donate blood to each other
  • Identical twins have strong organ compatibility in cases of transplants. Monozygotic twins are suitable organ donors for each other.

The cost of our Twin DNA test for 2 people is $259. Multiple siblings can be added to the test at an extra cost.