Unfortunately, as labs differ in their ranges for the tests members need the ranges to offer some advice. That's why, if at all possible, to get a print-out/copy from the surgery.
Just because blood tests may be low, that doesn't mean we feel well as doctors presume. Lots of us when first medicated begin to feel well then clinical symptoms come back, that's when the GP should increase the dose again.
This is an excerpt from a doctor who treated many patients. Dr Skinner and Dr Peatfield also did the same:-
Our treatment team uses the TSH level only initially to help clarify a patient’s thyroid status. But during treatment, we completely ignore the level. The reason is that the TSH level is totally irrelevant to normalizing the patient’s whole body metabolism and relieving his or her suffering. The only clinical value of the TSH level is to see the effect of a particular dose of thyroid hormone on the pituitary gland’s "thyrotroph" (TSH-secreting) cells.
There are two potential sources I know of for people feeling awful when they are on T4-replacement. One source is the extremely low dosage that doctors typically prescribe nowadays. A low dose of T4 can effectively reduce TSH secretion. The lower TSH can in turn lower the thyroid gland’s output of thyroid hormone. At the same time, low-dose T4 may not compensate for the thyroid gland’s reduced output of thyroid hormone. The patient then has too little thyroid hormone to properly regulate the metabolism of most of her body’s tissues. She then ends up with abnormally low metabolism and troubling hypothyroid symptoms.
Go to the date April 22, 2007 to read the whole question/answer.