Thank you for your query at DoctorSpring.com
From your description, it is clear that you had subclinical hypothyroidism for which the dose that was started was higher than required. Therafter, as you have reduced the dose, the TSH seems to be recovering. The T4 may be more than normal because of IVF treatment, if hCG injections or Estradiol hormone are being given. you can check your Free T4 to confirm that, which is likely to be normal. you can then wait for the TSH to recover. You can proceed with IVF treatment even if T4 is slightly high. Its unlikely to be harmful in any way.
Patient replied :
Thank you for the rapid and informative response, Dr. Muthukrishnan. So with the TSH currently still being low but recovering (previously was so low, the actual level wasn't even registering), it shouldn't be a concern for IVF treatment? And if I do get pregnant, will that cause any issues with my thyroid function, ie. Do I need to push for closer monitoring of my thyroid level when I do become pregnant? Or just as become symptomatic, I can request for further testing?
Yes, you need to monitor your thyroid function closely. Once you conceive, check it and then every three months. Till you conceive, check after 6 weeks.