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Ancestry.com

From SNPedia

http://www.ancestry.com/ uses an Illumina OmniExpress Plus, reporting ~700,000 SNP's for $99. The service is available in the USA, UK, Ireland, Australia, New Zealand, and Canada, as well as 29 additional more recently added countries from Europe to Asia. Raw data downloads are available.

  1. Log into http://ancestry.com
  2. Click on 'DNA' to show a pulldown menu, then click on the top choice "Your DNA Results Summary"
  3. Click on "Settings" in the upper right
  4. Click on "Download Raw DNA Data"
  5. Follow their instructions (enter a password, check a box, click 'confirm')
  6. Ancestry will send you an email with a link to your data
  7. In the email click "Confirm Data Download" it will open a new web page
  8. Click "Download DNA Raw Data"
  9. Your browser will begin to download a file named dna-data-2018-MM-DD.zip
  10. You do not need to unzip this file
  11. When the download is complete visit https://promethease.com
  12. If it's your first time, read the disclaimer and check the boxes if you understand and agree with the statements
  13. Click on "Upload raw data"
  14. Navigate to your Downloads folder and upload the dna-data-2018-MM-DD.zip file



In late May 2016 Ancestry began using a new microarray with higher coverage, Category:On_chip_Ancestry_v2.

For the benefit of anyone looking at Ancestry.com data files, be aware that the designation of chromosomes "23", "24", "25" and "26" in these files indicate the following:

  • If the Ancestry.com data file says a SNP is from chromosome 23, it's actually from the X chromosome.
  • If it indicates chromosome 24, it's from the portion of the Y chromosome that is not part of the pseudoautosomal region.
  • If it indicates chromosome 25, the designated SNP is from the pseudoautosomal region of the Y chromosome.
  • If it indicates chromosome 26, it's mitochondrial data (which is present in at least some Ancestry data produced since May 2016).


Raw data for a female often seems to have a small amount of Y chromosomal data reported. This has caused problems where Promethease has been confused. A discussion about this was visible at

An independent test for gender is rs12734338, at least in some microarray data; rs12734338(C;T) is seen in data from males and rs12734338(T;T) is seen in data from females.