Thanks for your comment.

Sitat Opprinnelig skrevet av Paul Robinson Vis post
Only very high rT3 numbers are usually helpful.
Yes, but how can one know how high this ratio is, in fact, if this ratio is not calculated correctly?

I understand your point very well, but I do not comment on the opinion about whather one can or can not use the ratio between T3 and RT3 for anything.

My only issue here is that in order to be sure of a correct result, both components must be present in the same unit of measurement, which in this case is a total value of T3 because the value of RT3 is already given in a total amount. If anyone wants or needs to know its own T3/rT3 ratio, it is necessary to obtain blood test to determine the total value of T3. Otherwise it's meaningless.