Originally Posted by
bizzarro
Those thyroid readings are below range and require further testing.
Total T4/T3 are of little diagnostic value since the free quota (FT4/FT3) is what's available on tissues and can be normal even when total assays are outside range, and that's what the TSH suggests.
As of test, yes it is very low for your age, but you need to pull FSH, LH and PRL as a bare minimum (in addiction to total and free T) in order to have a key to understand what's going on, whether the issue is primary (ie. testicular failure) or secondary (brain/pituitary).
I do deduct from the TBG reading that your SHBG must be also low/normal, hence you might still have free T within range.
You should also include a complete blood count (CBC) and a comprehensive metabolic panel (CMP).
And, what's most important... how do you feel?
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