First time on site. Have had an under active thyroid for many years and although I'm on 125mg of levothyroxine per day I never feel well. I'm overweight although I'm continually on a diet, I'm always tired and I'm prone to infections. Recently I asked for a print out of my results (which I've never had before) and was told that I was normal. I just want to check if this is so. Here are my results:
Serum free T4 Level 17.5 pmol/L (12-22)
Serum TSH Level 2.14 mU/L (0.27-4.2)
Serum free T3 Level 4.1 pmol/L (3.1-6,8)
Could someone please explain these to me.
Thanks Jennifer
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jennyr49
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The aim of thyroid replacement hormone (Levothyroxine) is to bring TSH down to around one and FT4 towards top of range and FT3 at least half way in range
Your FT3 is low - either because dose is not high enough or you are a poor converter of T4 to T3. Very common if vitamins are low or if you have Hashimoto's
All thyroid tests should be done as early as possible in morning and fasting and don't take Levo in the 24 hours prior to test, delay and take straight after. This gives highest TSH, lowest FT4 and most consistent results
Medichecks Thyroid plus ultra vitamin or Blue Horizon Thyroid plus eleven are the most popular choice. DIY finger prick test or option to pay extra for private blood draw. Both companies often have money off offers.
See Box 1. Towards end of article
Some possible causes of persistent symptoms in euthyroid patients on L-T4
You will see low vitamin D, folate, ferritin and B12 listed
Stop dieting! It won't make you lose weight while your FT3 is below mid-range, but will affect your conversion so that your FT3 stays below mid-range. You need calories to convert. You also need optimal nutrients, and it's unlikely you'll have them if you're always on a diet. Low-calorie diets are not recommended - especially not for hypos.
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