Although I was interested in the health and traits information, I was most excited about the ancestral information. 23andMe’s test looks at mtDNA, Y-DNA, and autosomal coverage. I believe that the company is working to report on ancestry of the X-chromosome, but as I have previously reported X-DNA ancestry can be extremely challenging.
This was my second foray into autosomal DNA testing. In 2003 I purchased an AncestrybyDNA 2.0 test from DNAPrint Genomics. The test looked at 71 Ancestry Informative Markers (AIMs) to determine percentages of Indo-European, East-Asian, Native-American, and African ancestry. It is worth noting that before AncestrybyDNA went out of business (more info here), the company was offering more advanced tests that examined as many as 1,700 markers (still far below the number of markers used to quantify percentages at 23andMe and deCODEme).