rs137852240
A SNP in the F9 gene on chromosome X. Its most notable genotype is T;T: Hemophilia B (severity varies)
- Gene
- F9
- Location
- Chr X139,551,217 (GRCh38)
- Highest magnitude
- 5.5Very important
- Tested on
- AncestryDNA
Genotypes
As shown in 23andMe and AncestryDNA files.
- C;CGoodcommon in clinvar
- C;TBadCarrier of a Hemophilia B mutation
- T;TMost notableBadHemophilia B (severity varies)
On SNPedia: (C;C), (C;T), (T;T). Magnitude rates how notable a genotype is from 0 to 10, not how risky it is.
Related
Other F9 SNPs
- i5007022A;G“royal disease” also known as hemophilia B or Christmas diseaseVery important
- rs398122990A;G“royal disease” also known as hemophilia B or Christmas diseaseVery important
- rs137852229C;CHemophilia B (severity varies)Very important
- rs137852230G;GHemophilia B (severity varies)Very important
- rs137852231C;CHemophilia B (severity varies)Very important
- rs137852232G;GHemophilia B (severity varies)Very important
- rs137852233A;AHemophilia B (severity varies)Very important
- rs137852234G;GHemophilia B (severity varies)Very important
Notes
From SNPedia
Notes
C;T
X-linked recessive, so females are generally unaffected in the absence of a second F9 gene mutation, however some females may experience clotting issues.
Source and license
Adapted from rs137852240 on SNPedia, using a snapshot taken October 16, 2026. SNPedia content is shared under CC BY-NC-SA 3.0 US, and this page is shared under the same license.
SNPedia is a community-edited wiki. Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice. Magnitude is a community rating of how interesting a genotype is, not a risk score.