My daughter is feeling under the weather and I suggested she ask her Doc for a blood test for T4, T3 and TSH, as well as iron, B vitamins and D. He refused on the basis that her bloods were taken in April and they were normal. She sent me through the results as follows;
Free T4 12.8 (range 12 - 22)
TSH 5.05 (range 0.4 - 5.50)
I have no thyroid due to Graves and her grandmother (my Mum) has taken thyroxine most of her life due to an underactive thyroid.