If you take the test when you are under medicated it will simply show you are under medicated. If your Levothyroxine dose is being increased wait until you have been on the increased dose 6-8 weeks before testing. You will need TSH, FT4 and FT3 tested at the same time to assess whether you are converting well or not.
I have read that you can only tell about conversion if you are on T4 only. As soon as you take anything with T3 in itcthen the results are teadcdifferently and the only accurate reading is the FT3 one.
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