Target locus
This module executes a targeted analysis of the ABO locus on chromosome 9.
The inference relies on the simultaneous validation of three transition/deletion markers to resolve the phenotypic blood group.
Free analysis · ABO locus
Infer your ABO blood type from raw DNA.
A focused interpretation of rs8176719, rs8176746, and rs8176747 from your 23andMe or AncestryDNA export — with every marker call shown alongside the result.
Run the ABO marker check
Choose the unmodified raw export from your provider. We inspect only the marker calls needed for this analysis.
Files are processed in-memory and never stored.
Drop your raw DNA file here
or.txt, .zip · 25 MB max
Method note
How the three-marker inference works.
This module analyses the ABO locus on chromosome 9, validating three critical transition/deletion markers to resolve your phenotypic blood group.
Marker rs8176719
Identifies the 'O' allele deletion — a single-base deletion causing a frameshift and a non-functional enzyme.
When both copies carry this deletion, the result is blood type O.
Markers rs8176746 & rs8176747
Distinguish A and B alleles by detecting nucleotide transitions that alter enzyme substrate specificity.
Together they determine whether a functional allele produces the A or B antigen.
Reporting scope
Resolves A, B, AB, and O groups from raw genotype data.
Each marker call is validated for completeness and allele quality before the final inference.