I had a blood test the other day , no major symptoms just always felt tired easily but coped since I can remember (currently 22) no hair loss and slim build and no weight gain at all . My TSH 13 (high ) and thyroxine 12 (low normal). Dr rang me and told me I need to take levothyroxine potentially for life. I am not conviced and want to request another blood test . I would rather take supplements or re test in a few months . Is this un reasonable and do people think I'm putting myself at risk?