# Interpreting results of siblingship test?

In general, a larger sibship index (>1.0) corresponds to a higher likelihood of relationship. The higher that the sibship index is above 1.0, the higher the likelihood that the two individuals are related as siblings. Likewise, a smaller sibship index (<1.0) corresponds to a lower likelihood of relationship.

## How do you read a sibling test?

In a siblings DNA test, we calculate a siblingship index. If the siblingship index is less than 1.00, this indicates non-relatedness. If the siblingship index is greater than 1.00, this indicates that the two tested individuals are more likely to be a true full sibling or half-siblings.

## What is a Siblingship index?

Siblingship DNA index

But if the index is more than 1.00, it means that the tested individuals are more likely to be biological siblings. The higher the index value is, the greater the possibility of two alleged individuals being full biological siblings.

## How much DNA should a full brother and sister share?

Average Percent DNA Shared Between Relatives

Relationship Average % DNA Shared Range
Identical Twin 100% N/A
Parent / Child 50% (but 47.5% for father-son relationships) N/A
Full Sibling 50% 38% – 61%
Grandparent / Grandchild Aunt / Uncle Niece / Nephew Half Sibling 25% 17% – 34%

## What is the DNA range for half siblings?

Half-siblings will typically share between 1300-2300 centimorgans (cMs) of DNA. For comparison, note that full siblings will share between 2300-3300 cMs. What is this? The range of centimorgans shared between half-siblings is important to note.

## What does full Siblingship mean?

Since full siblingship has been confirmed with 99.99% accuracy, that means that your sibling really is your full sibling. The reason it also says that half-siblingship has been proved (also with 99.99% accuracy) is because half-siblings have less DNA in common due to sharing only one parent.

## How many centimorgans do you share with a sibling?

Siblings share around 50% of their DNA while half siblings only share around 25%. The amount shared is usually expressed in something called centimorgans. Full siblings tend to share around 3500 centimorgans while half siblings share closer to 1750.

## What is the highest combined paternity index?

In duo cases, the highest value of CPI was 35,433,401,625.84 with a probability of paternity greater than 99.999999997%. One of the applications of Identifiler™system is to use for paternity testing.

## How accurate are sibling DNA tests?

Sibling DNA tests can thus test individuals to establish whether it is more likely that they share both parents, have one parent in common, or are unrelated. Across the DNA testing industry, sibling testing can be up to 40% inconclusive. AlphaBiolabs has been able to reduce this inconclusive rate down to 24%.

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