Not a very big deal but just as reference in case it comes up.
The confusion in using thyroid values comparatively between people is only mentioned as unique if someone is trying to look at these things another way.
The usual errors happen because they are based on inaccurate data which is being passed around by medical board texts, which haven't been updated as to the most current understanding. In this instance healthy/normal is more than just an average, it is distinct parametric amount, where the persons values may fluctuate but not as much person to person particularly as some pushing that idea might want to imply is important to the basic argument. Too low considered to be OK is very common recently.