I have gained 20 lbs in 3 months without changing my eating habit and it's difficult to lose the gained weight with different methods which i have tried. Below please find my blood test results:
FREE T4 12.6 pmol/L (10.0-25.0)
THYROID STIMULATING HORMONE(TSH) 0.99 mlU/L 0.20 - 6.00
Can this result explain my sudden weight gain?
Should I take Levothyroxine
While your FT4 is pretty low in the range, it doesn't really appear that you have a thyroid issue, at this point. Do you have, or can you get a Free T3 test? That's the hormone that correlates best with symptoms.
You might also want to get tested for thyroid antibodies to see if you have the autoimmune disease Hashimoto's Thyroiditis. With Hashi's symptoms can show up long before blood tests reveal a problem.
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