Thyroid test results vary from lab to lab. Accordingly, their ranges also vary a bit. The main difference is with TSH (Thyroid Stimulating Hormone). Most labs still use the older range of .5 - 5.0. Over 8 years ago the AACE recommended that it should be revised to .3 - 3.0.
The tests for Total T3 and Total T4, along with T3 Uptake, and Free Thyroxine Index, are somewhat outdated and should be replaced by the tests for the biologically active portion of thyroid hormone. These tests are Free T3 and Free T4.
Again, ranges may vary slightly among labs, but they will be fairly close to these ranges. For Free T3, I have seen 2.3 - 4.2 Pg/ml, and .23 - .42 ng/dl, and 3.5 - 7.7 P mol/L, and 230 - 420 pf/dl, and 230 - 619 pg/dl. For Free T4 I see .60 - 1.50 ng/dl as well as 10.2 - 19.2 Pmol/L and .8 - 1.8 ng/dl.
All this is why it is always important to get a copy of lab reports, so that you have the specific ranges to use for evaluation of your results.
"Normal" for you is whatever levels make you euthyroid, which means having neither hypo nor hyper symptoms. The reference ranges are so broad that hypo patients frequently have FT3 and FT4 results in the lower end of the range. The ranges should not be considered as pass/fail decisions. Instead the ranges should be considered as guidelines within which to adjust FT3 and FT4 as necessary to relieve symptoms. Symptom relief should be all important, not test results. Test results are valuable mainly as indicators, during diagnosis, and then to monitor FT3 and FT4 levels as meds are increased to relieve symptoms.
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