Quest diagnostics free t range

[tareload]

Let's look at those reference ranges on a linear scale, and not even bother with fTZ. Maybe one could compare Quest values to Mayo values, but anything else would seem to require some data massaging.
View attachment 20427

Thanks for recasting the data. Glad I had the data labels on there.

Two items from these plots:

1. Upper Ref Range: Your chart makes it clear there's almost 100% variation in upper limit from lab to lab [(highest lab value - lowest lab value)/lowest lab value]. High RSD.
2. Lower Ref Range: Reference labs agree pretty well on the lower range. fTz no where near the ref labs on lower limit. This is important fact that seems to be glossed over in the pro-fTZ papers and presentations.