My tsh has been ranging between from June to August 1.56 to 2.79 till November 21st when I got my tsh and t3, t4 done, my tsh came back as high as 29.35 with t3 and t4 normal, as I was too concernced I got my tsh and ft3 and ft4 done again on 28th november, where I could see a drop in tsh level to 16.65 and ft3 and ft4 normal, could you please let me what could be the reason of such high fluctuations