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Allele-specific likelihood-based test for the consanguinity among samples (AS_InbreedingCoeff)

Category Variant Annotations


Allele-specific likelihood-based test for the inbreeding among samples

This annotation estimates whether there is evidence of inbreeding in a population. The higher the score, the higher the chance that there is inbreeding.

Statistical notes

The calculation is a continuous generalization of the Hardy-Weinberg test for disequilibrium that works well with limited coverage per sample. The output is the F statistic from running the HW test for disequilibrium with PL values. See the method document on statistical tests for a more detailed explanation of this statistical test.


  • The inbreeding coefficient can only be calculated for cohorts containing at least 10 founder samples.
  • This annotation can take a valid pedigree file to specify founders. If not specified, all samples will be considered as founders.

Related annotations

  • InbreedingCoeff outputs a version of this annotation that includes all alternate alleles in a single calculation.
  • ExcessHet estimates excess heterozygosity in a population of samples.

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GATK version built at Wed, 9 Oct 2019 15:19:59 -0400.