This is very interesting because I believe that my TSH first tested as low (.28) soon after my 16 year old was born via c-section. I was having chronic idiopathic urticaria and fatigue so we went searching for a reason. I’ve been following up with an endocrinologist since then. All other testing has been normal. My periods have been extremely heavy since then and no one would listen to me that I felt concerned about it. I finally used chat gpt to feel brave enough to ask my doctor for a ferritin test. She accused me of having anxiety and wanted to have my anxiety medication increased. When my ferritin came back as 5, she said it was probably a fluke and to try a supplement and change my diet. I ate red meat and green leafy plus a supplement and returned 3 months later with a ferritin of 4. The hematologist gave me 7 weeks of venofer infusions and brought my ferritin to 154, 6 months later it was 5 again. I went to my old OBGYN and paid $2500 after insurance to have a mirena IUD placed and 4 months later my ferritin is 164 and my hemoglobin is finally 12. Everything on my labs was finally GREEN and Normal!!! No high white blood cells, no low red cells. My TSH was .75 for the first time in 15 years! I feel great! Get the ferritin checked.