A TSH test by itself is a very poor diagnostic. There are two types of hypothyroidism: primary and central. Primary is caused by the most common cause for diagnosed hypothyroidism, which is Hashimoto's Thyroiditis. Hashi's occurs when the autoimmune system erroneously identifies the thyroid gland as foreign to the body and produces antibodies to attack and eventually destroy the gland. As the gland is being destroyed, the TSH level continues to rise in an attempt to get more thyroid hormone produced by the thyroid gland.
Central hypothyroidism is related to malfunction in the areas of the hypothalamus or pituitary. Central is characterized by relatively low TSH and thus inadequate levels of the biologically active thyroid hormones Free T3 and Free T4.
So TSH alone is a poor indicator of thyroid status. Far more important indicators are symptoms, and also levels of Free T3 and Free T4. Have you been tested for those? If so, please post results and reference ranges shown on the lab report. Also, please tell us about any symptoms you are having that may have prompted the TSH test.
And please explain the bld, qn you mentioned. I am missing something there. LOL