Can anyone tell me the minimum healthy reading for tsh levels?

It varies: Each lab will have established it's own reference range. Typically, the lower limit of normal is somewhere between 0.2 and 0.5. Treatment is usually recommended for TSH levels below 0.1, and may be recommended in select cases for levels between 0.1 and the lower limit of normal.

TSH Level: Tsh level ( thyroid stimulating hormone level) has a big range, and may vary in different laboratories range of TSH in diagnostic laboratory services of hawaii is: 0.27----4.20 please see your physician for medical examination including thyroid status, assessment of anxiety and depression, follow up of TSH level, and for needed treatment.