If you can get a print-out of your last blood test results, with the ranges, and post them on a new question members will be able to respond.
Three words not to take at face value, is 'normal, o.k.' or fine' when referring to blood tests for your thyroid gland. We usually feel much better when our TSH is low or very low and some need it suppressed but many doctors wrongly believe if the TSH is even at the higher end of the range that we've sufficient hormone replacement. Not true.
If you've not had a blood test for a while tell your doctor you need a Full Thyroid Function Test (TSH, T4, T3, FT3, FT4) which he may refuse to do and also some labs don't if your TSH is in range.
If he says he cannot request a full thyroid blood test request a TSH and Free T3 only. This is the reason why a Free T3 is important but rarely done and to read the rest of the extract go to
FT3 = FREE T3
T4 converts to T3 and is the only thyroid hormone actually used by the body's cells.
The approx. reference range for Free T3 is 4 to 8.3
We at Thyroid UK believe that you need to know your Free T3 level too because this will often show low if you are not converting, and high if you have blocked receptor cells. Even if you are converting, the body needs the extra T3 that a normal thyroid produces. There has been some research to show that people feel better on a mixture of Thyroxine (T4) and Triiodothyronine (T3). Effects of Thyroxine as Compared with Thyroxine plus Triiodothyronine in patients with hypothyroidism – The New England Journal of Medicine Feb.11, 99 Vol. 340."
If you've not also had your Vitamin B12, Vit D, iron, ferritin and folate tested for a while ask for these too.
Your blood test for thyroid hormones should be at the earliest and fast (you can drink water) and leave about 24 hours between your last dose of levo and the test and take it afterwards.