Hi
I would really appreciate some advice from someone who knows about Thyroid/TSH results. I feel like I am losing my mind thinking about this but I think I may just be stressing myself out unnecessarily and overthinking things since going back into the IVF world.
Long story short, I underwent fertility treatment in 2020/21. At the time my clinic measured my TSH levels and said they were fine. They were around 3 and started rising over treatment to 3.9. Now the majority of the fertility world says below 2.5 for TSH for optimal fertility and closer to 1 is ideal. However my clinic is adament that anything below 4.5 is fine (they are attached to a large teaching hospital in London so do a lot of research). I can't understand why they would say below 4.5 is OK if it wasn't as they report their results and want success. They wouldn't have a policy that was detrimental to their pregnancy rates. But why then does every other clinic seem to say below 2.5? I found it worrying at the time and was about to shell out thousands for a fresh round of IVF so they agreed to put me on 0.25 thyroxine which I started along with my other fertility meds. That round was successful. I kept taking it throughout pregnancy but once I gave birth my GP tested my TSH and said I didn't need it anymore and stopped the prescription.
Now I am about to start on a frozen embryo transfer - it is our one and only embryo so I am super on edge to do everything possible to support the procedure. My TSH was above 3 end of Nov when they tested it at the clinic. I had read on here that thyroid tests should be done in the morning around 9am before eating so I organised to get the full thyroid Function test from medichecks. These are the results I just got in:
TSH 3.44 mU/L (Range: 0.27 - 4.2)
Free T3 4.81 pmol/L (Range: 3.1 - 6.8)
Free Thyroxine 14.0 pmol/L (Range: 12 - 22)
Thyroglobulin Antibodies 10 IU/mL (Range: < 115)
Thyroid Peroxidase Antibodies 9 IU/mL (Range: < 34)
CRP HS 0.42 mg/L (Range: 0 - 5)
Ferritin 60.5 ug/L (Range: 13 - 150)
Folate - Serum 37.36 ug/L (Range: > 3.89)
Vitamin B12 - Active X >150 pmol/L (Range: 37.5 - 150)
Vitamin D 95 nmol/L
Based on these results should I be pushing the fertility clinic to go back on a 25 dose of thryoxine to get my TSH down?
Does anyone know if TSH over 3 is bad for the results of a FET or if it is more likely to impact natural attempts to get pregnant? I have very low AMH so the thought of going through further fresh rounds of IVF is a daunting (but likely) prospect. Any advice or help would be greatly appreciated.
Thank you
High thyroid antibodies and fertility treatment 
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Thyroid function blood test results. Please help me understand these. 
