what time of day is tsh highest
Thirty-five years ago, fluctuating TSH levels were demonstrated and found to be at their highest in the middle of the night. 1 Current research suggests that TSH serum levels peak at between 2 am and 4 am and decrease to their lowest levels at between 4 pm and 8 pm. 2 Thus, the lower afternoon TSH levels found in the current abstract are consistent with previous research.