The 23andme founder talks about this here on quora: http://www.quora.com/How-do-the-tests-conducted-by-Counsyl-d...

The Counsyl CTO gives the tl;dr response: 23andMe is recreational genomics, Counsyl is clinical genomics.

Hi Andrew,

This is David Lee here. Feel free to send them to me, Brian Pokorny and Kevin Carter directly at david.lee@gmail.com, brianp@gmail.com and carterkev@gmail.com. Thanks!