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The twin DNA test is a genetic comparison to establish whether twins have an identical DNA profile or not.
This analysis is able to determine whether twin sisters or twin brothers are identical or fraternal twins.
Furthermore, the twinning test does not make it possible to define whether people are twins or simple brothers and sisters.
It is important to do this test knowing that the people are from the same multiple pregnancy.
The test can be done after birth with buccal samples only.
What is a Twin test?
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It is possible to do a DNA test for twins at home in a private setting. The order can be placed directly on the internet from your home in order to receive the sampling equipment at home.
Today, it is still impossible to obtain a DNA test in a pharmacy, only a laboratory with genetic analysis equipment and accredited by international standards can provide the result for a DNA test.
How to do a DNA test with twins?
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The DNA test for twins can be carried out with:
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Saliva samples (sterile buccal swabs)
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Non-standard samples : Like hair, nails, toothbrush...
Be careful, you must follow the instructions and respect the conditions so that the samples provide enough genetic information for your test.
What type of sample is used for the test?
Prefer to receive a DNA kit?
We also work with the associated laboratory EasyDNA.
Order your test
Get instructions
Collect samples
Send to the lab
Discover your results
Your samples are analyzed by our partner laboratory:
Endeavor DNA Laboratories
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We don't send DNA kits!
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It's up to you to make your DNA kit with saliva samples.
You can place the order from any country.
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Place your order to receive by email:
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your customer code;
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sample collection instructions;
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the online consent form;
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the shipping form to print, fill out and send;
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the laboratory's address.
Product details
The DNA test and instructions include the use of saliva samples for both participants.
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Addition of an extra participant: 99.00€
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Addition of a non-standard sample: 69.00€
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Organization of the sample shipping by the laboratory: 50.00€ (FEDEX)
All options must be requested by email: contact@infotestadn.com
Options
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Results within 3 to 5 working days after receipt of saliva samples.
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Results within 10 working days for other types of samples
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The results are sent by email and then automatically destroyed within 60 days.
Results
Twin Test
Identical Twins
Identical twins are the result of a single fertilisation of an egg by a sperm.
The embryo, thus formed by this fertilization, then divides in two to generate two fetuses which entirely share the same genes.
So they are always of the same sex : two girls or two boys.
This is also called Identical or Monozygotic Twins.
Fraternal Twins
The fraternal twins are the result of a separate double fertilization occurring around the same time.
Thus two separate eggs are fertilized by two different sperm and the fertilized eggs then develop separately in the same uterus.
In this construct, the twins are dizygotic, “fraternal twins ” so they are similar to all other siblings, meaning they only share half of their DNA.
Fraternal twins can be of the same or opposite sex and most often with dissimilar physical characteristics.
The Participants of the Twin test
Twins are siblings born from a multiple pregnancy, characterized by being born at the same time and often having a very similar physical appearance. However, it would be a mistake to assume that all twins look alike.
Conducting a twin zygosity test allows confirmation of whether twins share identical genetic profiles or not.
This confirmation can establish whether they are identical twins (monozygotic) or fraternal twins (dizygotic).
The zygosity test can be performed using the DNA of two or more twins from a multiple pregnancy.
Parental DNA is neither recommended nor considered, as the comparison is made directly between the genetic profiles of the twins.
It is unnecessary to conduct a twin zygosity test for siblings, as they are not from the same pregnancy and therefore do not have identical genetic profiles.
The authenticity and reliability of a twin zygosity DNA test depend on several factors:
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Sample quality
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Laboratory accreditation
If you want to determine your biological relationship, then a DNA test is the solution for you.
However, be cautious: the quality of your results depends on how you collect and preserve your samples. Be sure to follow the laboratory’s instructions carefully for reliable results.
Reputable laboratories with ISO 17025 accreditation for zygosity testing adhere to strict standards for quality analysis processes, flawless resource and equipment management, impartiality, and complete confidentiality.
The reliability of the results depends on the number of genes compared. Typically, laboratories test an average of 15 to 22 genes (STR loci) for comparison between participants.
A twin zygosity test can provide a 100% reliable negative result and a 99.9% reliable positive result. So don’t wait—take your own DNA test today!
How reliable are the results?
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The results are presented in the form of a table:
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Each column corresponding to a participant
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Each line has a gene from the profile
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The composition of the gene is represented by one or two numbers per person
Participants must have a similar full genetic profile to be considered identical twins.
If the match is perfect on all rows, the relationship is concluded, otherwise it is rejected.
How to read the results of a DNA test with Twins?
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4 at 7 days using buccal swabs
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This delay is calculated from the moment your samples arrive at the laboratory. Transport time is not taken into account.
What are the analysis times for a Twin test?
Why do a DNA test between twins?
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There are many reasons why twins or parents of twins want to do a DNA test for twins.
Curiosity : beyond physical traits and a similar character, the twinning test can be wanted for private and recreational purposes of curiosity to determine if siblings have a profile identical genetics.
Medical Necessity : It is important to know if the twins have and share genetic and hereditary diseases. In order to better protect yourself if symptoms appear.
It is also interesting to be able to know their compatibility if medical operations are to be expected, such as during a blood transfusion or a transplant. An identical twin is the ideal candidate to guarantee the success of a surgical intervention, because the risk of rejection of the transplanted organ is ruled out since they share the same antigens.
A medical error : whether during childbirth or by IVF, doing a twin test can thus confirm whether the two brothers or sisters are indeed from the same fertilization and therefore rule out the slightest medical error in the laboratory or at the maternity ward .
Doubt of paternity : the twin test does not make it possible to define the paternity of twins. On the other hand, if the twins are fraternal twins, it remains possible, but rare, that the paternity of the twins is double. In this case, it is much more reliable to do a paternity DNA test between the father and the children: Paternity Test .
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Can we do the Twin test remotely?
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Yes, you can take saliva samples remotely, before sending them back to the laboratory. In this case, each participant will receive their DNA kit to take the samples at home. Everything must be returned within 3 months of your order, as DNA on mouth swabs only have a shelf life of 3 months. The analysis begins when the laboratory receives all the samples.
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How to do a Twin test in Pharmacy?
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It is currently impossible to order a DNA test in pharmacies. Genetic analysis is offered by accredited laboratories that offer their services online or on site.
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Can we do a Twin test between brothers and sisters?
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It is technically possible for the laboratory to compare the DNA of siblings to determine whether the genetic profile is similar or not. But if you already know that the participants are not from the same multiple pregnancy, then the test will not help you. Because the twin test does not make it possible to determine a relationship.
If you are looking for a paternal bond between brothers and/or between sisters: Sibling Test
Frequently Asked Questions
You can do a DNA test even if the participants are geographically distant; even in different countries.
Several possibilities are realized depending on the availability of participants and the DNA test you want to do.
Remote DNA Test
eye color
Eye color can be a clue to the biological relationship between two people from the same family.
Do you know how it works? Several parameters are taken into account in the genetic inheritance from parents to children.