Recommended TSH levels by most labs are quite misleading. They advise that levels between 0.5-4.0mIU/L are considered acceptable. Research shows that TSH levels greater than 2.5mIU/L are predictive of evolution to hypothyroidism, and an increase in TPO (thyroperoxidase) antibodies. We need a re-evaluation of the TSH reference range, and need to encourage our health care providers to interpret the results properly.
Generally, most people reach for the iodine as soon as they get a hypothyroid diagnosis, but this can have nasty effects. Taking iodine has been seen to increase TSH and TPO levels. A 2003 study REMOVED iodine supplementation in hypothyroid patients and found that 78.3% of the sample regained normal thyroid function.
It’s always best to test when dealing with thyroid issues to avoid making symptoms worse.