I'm not sure total accuracy is the point. Rather, I think it's about the claimed value being correct. If 23andMe say a test has a 20% accuracy, they should be a

I'm not sure total accuracy is the point. Rather, I think it's about the claimed value being correct. If 23andMe say a test has a 20% accuracy, they should be able to prove how they came by that number. There's a big difference between telling someone they have a 5% chance of something and telling them they have a 25% chance of something - even though both are uncertain.