1. Ouch. 2. What others who know more have stated is that for many tests, there's a fundamental difference between venous blood (taken from a high-volume vesse

1. Ouch. 2. What others who know more have stated is that for many tests, there's a fundamental difference between venous blood (taken from a high-volume vessel) and capillary blood taken from a tiny blood vessel in an extremity. It seems that it's not all about volume.