DNA Sibling Testing
A sibling test can help determine whether two individuals are full or half siblings. Our laboratories provide powerful testing for sibling cases. Every sibling test that we perform examines three areas: whether two people are full siblings (same mother and father), whether two people are half siblings (only one parent in common), or whether two individuals are not related as siblings (different mother and father).
A sibling test is usually ordered only in cases where it is impossible to test the parents (deceased, missing, unable to participate, etc.). This is because the sibling test is not as powerful as a paternity test. The relationsip between a parent and child is very direct, and thus, paternity or maternity testing will always provide conclusive results. However, the relationship between two siblings is not as direct. The results of a sibling test may provide you with an indication of whether two individuals are related, but depending upon each case, the results may not always produce conclusive answers.
$149.00
Need a legally admissible test for court?
Understanding Sibling Testing
When a sibling test is performed, the laboratory will test all 16 STR markers on each of the potential siblings in order to obtain a full genetic profile for each individual. The genetic profile of the individuals are then compared against each other and statistical calculations are performed to determine the likelihood that the two individuals are siblings based on the similarities of their genetic profiles.
Depending upon the numbers of markers that are shared between the potential siblings, the rareness of the markers and the pattern in which the markers appear, the laboratory will use statistics to generate a sibling index. The index which is generated will provide information regarding the relationship between the two individuals. If the two individuals are full siblings, the full sibship index will be higher than the half sibship index. If the two individuals are half siblings, the half sibling index will be greater than the full. If the two individuals are not related the sibling index should be below 1.0 and if the two individuals are truly siblings, we would expect the silbingship index to be above 1.0.
Because the sibling test may not always provide conclusive results, we recommend the paternity test wherever possible. However, if it is impossible to conduct a parentage test, the sibling test may be the next best option for you. If you would like to discuss the limitations of this test in more detail, please contact our laboratory directly at 1-855-552-3244.
Guide for Home Testing Procedure
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Confirm the biological relationship between a potential father and child.
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Find out whether siblings are full siblings, half siblings, or not related.
Highest Standards
- All tests run 2x using 16 loci STR DNA technology
- Easy to use home DNA collection kit
- Quick, painless, discreet mouth swab collection kit
- Results in 1 to 2 business days
- Testing the mother is optional
Split Kit
If the test participants live separately, we can ship the individual swab kits to each person’s address. To request a split kit, please mention “split this kit” in the comments section when ordering online and tell us where to send each part. Alternatively, we can send you the whole kit to divide and send out yourself.
Shipping
Online orders can be placed 24/7 and will be shipped within 1 business day. Next business day express courier shipping is available in US and Canada only. International orders will be shipped via priority air mail.
Legal Testing Guarantee
The private test is the best solution for those who need to find out the truth about paternity before deciding on the next step. If, after you receive the results of your private test, decide that you need the legal test, the full cost of the private test will be deducted from the legal testing cost, so you don’t need to pay twice!
