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Understanding the different versions of the 23andMe genotyping chip

The raw data provided by 23andMe is an advanced view of all the uninterpreted raw genotype data, including data that is not used in 23andMe reports. This data has undergone a general quality review however only a subset of markers have been individually validated for accuracy. As such, the data from 23andMe's Browse Raw Data feature is suitable only for research, educational, and informational use and not for medical or other use.

The 23andMe Personal Genetic Service® analyzes the DNA in your sample using microarray genotyping. Currently, we genotype customers using a custom Illumina HumanOmniExpress-24 format chip; this is the 4th version of our genotyping chip and it is referred to as v4.

23andMe periodically updates its genotyping chip in order to take advantage of improvements in technology, to make updates to information provided in the Personal Genetic Service, or to offer flexibility for future research.

Depending on when your sample was genotyped at our laboratory, it may have been genotyped on a previous version of our chip. The genotyping chip your sample was tested on impacts which genetic markers are included in your raw data, and in some cases, the reports available in your account. You can see which version of our chip was used in the analysis of your sample on the Download Raw Data page in your account.

Customers have previously had the ability to update from an older chip version to the current chip version at a discounted price. With the launch of the new 23andMe experience, we have temporarily paused updating chip versions while we transition existing customers to this new experience. More information will be available at a later date.

History of 23andMe Genotyping Chip Versions 


  • In 2006, 23andMe was founded and began genotyping customers on the version 1 (v1) genotyping chip.
  • In September 2008, 23andMe announced the version 2 (v2) genotyping chip.
  • In January 2011, 23andMe announced the version 3 (v3) genotyping chip.
  • In November 2013, 23andMe announced our current, version 4 (v4) genotyping chip.

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