Your Results #
On your Sibling DNA Test report, you will find a chart displaying the DNA profiles for each person tested. The DNA profile chart may look something like this:
| DNA Locus | Sibling 1 | Sibling 2 | Sibling Index |
| D8S1179 | 13,14 | 14 | 1.32 |
| D21S11 | 28,30 | 28,30 | 4.25 |
At the bottom of the table, you will see a Combined Sibling Index.
The Combined Sibling Index is calculated by multiplying the the sibling index values for each DNA locus, and it is the final result of a DNA Sibling Test. The sibling index represents how many times more likely it is that the tested individuals are full-/half-siblings (for a FULL sibling test) or half-siblings rather than not related (for a HALF sibling test).
| Sibling Index | Explanation |
| 10 | The individuals are 10x more likely to be true siblings than not siblings. |
| 100 | The individuals are 100x more likely to be true siblings than not siblings. |
| 0.01 | The individuals are 100x more likely not to be true siblings than siblings (1/0.01 = 100). |
In general, a larger sibling index (>1.0) corresponds to a higher likelihood of relationship. The higher that the index is above 1.0, the higher the likelihood that the two individuals are related as siblings.
Likewise, a smaller sibling index (<1.0) corresponds to a lower likelihood of relationship. The lower that the index is below 1.0, the lower the likelihood that the two individuals are related as siblings.
Recommended Interpretation of the Combined Sibling Index
| Sibling Index | Interpretation |
| Greater than 10 | The genetic evidence is supportive of relationship. |
| 0.1 to 10 | The genetic evidence is inconclusive of relationship. |
| Less than 0.1 | The genetic evidence is not supportive of relationship. |