Original Medicare (parts A and B) and Medicare Advantage (Part C) both cover the full cost of a TSH (thyroid-stimulating hormone) test. That said, you’ll usually need to meet your deductible first.

Runs should be spaced over a clinically representative interval (i.e. 6 to 8 weeks for TSH in an outpatient setting). Use at least two different lots of reagents and two different instrument ...

TSH reference intervals should be established from the 95 % confidence limits of the log-transformed values of at least 120 rigorously screened normal euthyroid volunteers who have: ...