Ideal TSH for pregnancy

[FertilityHelp]

Dear Dr. Lupo,

My last TSH was 0.18 and my reproductive endo said that this was in the right range for conception. However, I have had no luck so far and am having irregular periods and ovulation. I am wondering if this could be related to my TSH number and if there is a preferred range for this in trying to conceive.

Thank you kindly for any advice,
FertilityHelp!

[Mark Lupo, M.D.]

I doubt that the ovulation is impacted significantly, but you could decrease the dose a little bit to bring the TSH up some to exclude that as a possible variable -- talk to your doctor about that option.

[FertilityHelp]

I am currently taking 100 mg of Synthroid and 7.5 mg of Cytomel per day (one pill in the AM, 1/2 pill in the evening.)

Do you think this level of TSH could be impacting my ovulation cycles or should we be looking elsewhere?

Thanks,
FertilityHelp!

[Mark Lupo, M.D.]

TSH of 0.18 is not typically associated with more difficulty coneiving.  Is this on thyroid medication or is your thyroid a little over-active on its own?  

The target suggested range before and during pregancy is about 0.3-2.0, but we have recognized that a slighly low TSH is better than a slightly high one and we know that during the first part of pregnancy a TSH can be very low without problems.