@kdfrawg Just reading what the National Institute of Health [niddk.nih.gov] says:
The A1C test result can be up to 0.5 percent higher or lower than the actual percentage. This means an A1C measured as 7.0 percent could indicate a true A1C anywhere in the range from ~6.5 to 7.5 percent. Health care providers can visit www.ngsp.org to find information about the accuracy of the A1C test used by their laboratory.
Clearly no one cares about accuracy in this industry.