Over the years we've had members test side-by-side NIR and Wet Chem and found up to 30% difference in results.
I just did the same with my current crop. The NIR ESC result was 26% less than Wet Chem results. That could make a big difference for EMS/IR horses.
My clients have often found the same.
Nancy C in NH
ECIR Moderator 2003
ECIR Group Inc. President/Treasurer 2021-2022