I have undergone several tests to find the root of my fatigue. Sleep test ruled out sleep apnea. Most blood
tests are normal
. One thyroid test pointed to the pituitary: TSH was not raised (0.86 mIU/L) in conjunction with a low FT4 (8.2 pmol/L). ACTH, prolactin, FSH & LH tests at that time were normal so my doc didn't follow up. B12 & ferritin have both been low in the past, but supplementation didn't help my morning exhaustion.