"23andMe demonstrated a high level of accuracy (greater than 99% concordance to Sanger sequencing) and precision (demonstrated by studies yielding greater than

"23andMe demonstrated a high level of accuracy (greater than 99% concordance to Sanger sequencing) and precision (demonstrated by studies yielding greater than 99% reproducibility and repeatability)" Sanger sequencing is pretty accurate, on the order of 99.9%. So if 23andMe is matching those at over 99% accuracy and precision, a full sequence may not be necessary. The FDA took a long time to approve this, so I'd imagine it passes their standards as well.