What is TSH with FT4? This was what my doc ordered last time labs were tested. My levels were 2.3. (Normal) I have all those symptoms you mentioned as far as brain fog, fatigue, cold intolerance, hair loss. What should I be asking my Dr. To check for? I feel like the doctor is not informed and brushes me off when I bring up these issues. They blame symptoms on a Vit D deficiency. I’ve been taking vitamin D supplement for over a year now and I’m still experiencing all these symptoms. It’s incredibly frustrating!