Sueirving, TSH 0.13 is below range 0.27-4.2. FT4 20 is high in range 12-22. In my opinion these mean you are optimally dosed but some GPs will consider TSH below range may indicate over medication. If you are symptomatic you could order a private thyroid test from Blue Horizon and Genova to see what your FT3 level is and whether you are converting T4 to T3 well.
Potassium, Creatinine and Sodium are within range. There doesn't appear to be a range for GFR which I think is a kidney function test. labtestsonline.org explains what these tests are, and why they may have been ordered.
I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.
Sueirving, TSH would probably have been in range if you'd had an early morning fasting test. If you took Levothyroxine more than 6 hours before the test it's unlikely to have made any difference to FT4.
The reason early morning fasting tests are advised, and Levothyroxine should be taken after the blood draw, is to avoid GPs deciding you are overmedicated and reducing dose.
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