Here is a list of our most frequently asked questions.
Prenatal DNA Paternity Testing
Please see this link for prenatal testing.
Please see our accuracy section.
Where the alleged father is the biological father.
Where the alleged father is not the biological father.
When two siblings truly are full siblings, the siblingship index can vary dramatically, depending upon which of the following scenarios occurs:
1. True Siblings Who Share Rare Genes
2. True Siblings Who Share Common Genes
3. True Siblings Who Share No Genes
Mother: A1A2 Father: A3A4
Two true offspring of the mother and father above could be A1,A3 and A2,A4. Thus, the two true siblings could actually have no genes in common. This would calculate as a low siblingship index, even though the two siblings actually are full siblings. When two siblings are not full siblings, the same kind of variability in the likelihood ratio can occur.
4. Non-Siblings who Share Rare Genes
If it is known that the two children share a mother, it is preferable to test the mother's sample with the children's samples to increase the accuracy of the test. While a siblingship study is not the optimal way to test for familial relationships, the DNA test is the most accurate test available. Routine paternity tests typically take one week, but a siblingship study can take several weeks to complete.
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