Was the TSH of 4.5 in range? It's very high so you should have had an increase.
Difference in TSH could be antibody activity or possibly you had an infection which could raise it. CRP is an inflammation marker and as yours is over range it's telling you there is inflammation somewhere or infection.
My GPs work on over 6 is high so wouldn't increase my levothyroxine at 4.5. It just confused me that literally Friday my tsh was 4.5 and Monday it was 6.6. Thanks for the information on crp - I will go back to my gp regarding this x
Your GP is wrong. I would take a copy of the Dr Toft Pulse article stating that TSH needs to be under 1 and free T4 in top quarter of range to your next appointment.
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