Lab Work
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Lab work has a lot of value to it but needs to be interpreted carefully, just because the results are "in range" doesn't mean you will feel well, they need to be in the right part of the reference ranges.

There is lots of information on interpreting Lab numbers here

There are some excellent resources on lab work, including many that you can order without needing a Dr, on the STTM Lab page

RT3 and FT3 tests can be ordered without a Dr and there are sources of this in the Yahoo RT3 group files area. In particular Econolabs and Life Extension are currently the   cheapest sources for RT3 testing.

The prime diagnostic for RT3 issues is the ratio of Free T3 to Reverse T3. Once they are in the right units (the units used by labs differ so some have an FT3 range of 230 to 450 whereas others might have a range of 2.5 to 4.5) then the ratio of Free T3 divided by reverse T3 should be 20 or greater. If it's less then that you have a RT3 problem There are some worked examples here and this page is essential reading if you are confused about ratios.

If you only have a T3 reading rather than a FT3 reading then the ratio of T3 to RT3 needs to be 10 or greater.

A cautionary note is that a FT4 reading that is over 1.4 is a marker for RT3 being high.