Your TSH is a pituitary hormone which regulates the thyroid ...
It gets high when your body is LACKING in enough thyroid hormone ( Synthroid is T4 = the thyroid hormone made by the thyroid gland...it is chemically identical...)
The TSH is checked to gauge your body response to the medication and normal range is 0.5 to 4.5...
To judge the appropriate dose it also is important to screen for symptoms ...
Too high of dose of SYNTHROID may cause you to have anxiety / insomnia/ high heart rate / weight loss/ diarrhea / heat intolerance
(Too low may cause dry skin/ hair loss / constipation/ fatigue / depression / cold intolerance )
Your low TSH suggests that your dose of Synthroid may be too high for you...this MIGHT be adjusted back down to 112 mcg / day and recheck TSH ( and discuss with you how you feel ) in about 2 months time ..
I hope that this information is helpful for you
Let me know if you have further questions or concerns
I will be happy to get back with you
If my answers have been helpful and to your satisfaction then please remember to leave positive feedback
Thank you and Best Regards,
Anthony Bray MD