Fluffy1910, arrange an early morning, fasting (water only) blood draw as TSH is highest early and falls post-prandially. If you are taking Levothyroxine take it after the blood draw. TSH and FT3 levels fluctuate throughout the day night but I'm not aware that they are affected by menstrual cycle.
I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.
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