080 099 9239STR analysis – Short tandem repeat analysis (or sometimes Microsatellites, also known as Simple Sequence Repeats ) are basically repetitions of certain sequences of DNA.
In this type of DNA test we use short tandem repeats to determine how much common DNA two individuals have.
- Full siblings will share around 50% of their DNA (25% inherited from each parent)
- Half siblings will share around 25% of their DNA (this is because they only have common DNA from one parent rather than from both)
- Unrelated individuals can still have common DNA.
Once we have extracted and analysed the DNA, we proceed to apply complex statistical calculations to decide which sibling relationship is most likely thus establishing whether the people tested are most likely to be full siblings, half siblings or unrelated siblings).
Including the sample of any known parents is a great way to increase the accuracy of your DNA test result. You can include the sample of the mother or the father; this will help us exclude the genetic markers inherited from that parent.
Your relationship test result will highlight such terms as the probability of relationship and the first order indexes. Why not learn more about Interpreting the result of a DNA Relationship Test ?
Buccal swabs are the quickest and easiest way to collect your samples. Take a look at our DNA sample collection guide. If you are unable to submit buccal swabs and need to submit other DNA samples such as nail clippings, tooth brushes or other samples, visit our DNA forensic testing page. If you intend using any of the samples listed on our forensic testing page, we strongly suggest you consult us for information on collecting and packaging the sample.
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