Siblingship DNA Testing

Are You Sisters or Brothers?
You Share The Same Father? or
The Same Mother?

Siblingship DNA Testing determines the statistical probability of whether siblings (brothers and sisters) share the same two parents or not.

The cost of the DNA testing service includes two siblings, but you may add more as needed; for instance a third sibling.

In situations where the alleged parents are unavailable for testing, a DNA siblingship test can be performed to analyze the relationship of biological siblings. Including one common parent greatly increases the accuracy of this type of analysis and is recommended if at all possible.

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At Unilab Express, each sample is tested twice. Unlike at-home paternity tests you can buy online where there is room for error; each DNA sample is tested for 16 different DNA markers which gives you the highest accurate test results.

Our professional staff is highly trained to perform DNA Tests and will do all the paperwork for you. We are happy to answer any question you have, and if you make an appointment, we make sure you are in and out in 15 minutes.
How Is Siblingship Determined?
Siblingship DNA Test will give you a siblingship DNA index. When the index is below 1.00, this indicates that the siblings are not related. If the siblingship DNA index is greater than 1.00, this indicates that the two tested individuals are more likely to be true biological siblings. The higher the value of the siblingship DNA index, the greater the likelihood that the two individuals are true biological siblings.
Half Siblingship vs. Full Siblingship?
To analyze the possibility that the siblings share only one common parent versus two common parents (mother and father), a half siblingship DNA index is obtained. The ratio of the half siblingship DNA index versus the full siblingship DNA index would provide you with an idea of whether the two individuals are more likely to share only one common parent (e.g. mother only) or two common parents (mother and alleged father).

Half Siblingship: Sibling 1 and Sibling 2 do not share the same mother and they want to find out if they share the same biological father—in this situation, a half siblingship DNA test is performed.

Full Siblingship: Sibling 1 and Sibling 2 share the same biological mother but are unsure if they share the same biological father—in this situation, a full siblingship DNA test is performed.
How Accurate Are The Results?
Including one common parent greatly increases the accuracy of this type of analysis and is recommended if at all possible. If this is not possible, disclosing that siblings share a common mother or father can also lead to more meaningful results.
Who needs to be tested?
At a minimum, both assumed siblings must provide a sample. We also recommend that one or more of the parents, such as the mother, provide a sample for analysis. If the parents are not available, samples from other "known" siblings are also recommended.
Can twins that are born at the same time have different fathers?
In some cases, fraternal twins can actually be half-siblings, with different fathers, even though they are born at the same time. DNA testing can help to determine whether fraternal twins have the same or different fathers.
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