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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does The TSH Value Rise During Pregnancy?

I am six weeks pregnant. In 2002 I had Grave s disease treated with radioactive iodine. I had a healthy pregnancy and birth in 2003-2004. As soon as I conceived then, my tsh went right up to 6 or 7 and my meds had to be adjusted. I had a miscarriage in December of 09 and then my tsh and free t4 were normal. My tsh and free t4 are now currently normal at 6 weeks as well - tsh 3.05 and free t4 21. I was just wondering if tsh automatically rises with pregnancy and should I be concerned this pregnancy isn t going to work out either?                                                                  
Mon, 22 Feb 2016
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OBGYN,  's  Response
Hi there,
Welcome to HCM,

I understand your concern, but TSH values being normal is a positive finding not to cause you more anxiety.

TSH values do rise in normal and in persons who have had hyperthyroidism treated before. The radioactive iodine destroys the thyroid gland and thyroid supplements are required through out when TSH levels go high, more so in pregnancy.

You have linked your first pregnancy with high TSH to normalcy and thinking that your second pregnancy where you miscarried due to Low TSH, but that is not so. 1 in 5 of all pregnancies miscarry even in women without any medical condition so we cannot attribute the lost pregnancy to thyroid.

You need to make sure that the TSH levels stay normal in this pregnancy and that you get this checked three monthly atleast.

Hope this helps.
Regards.
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Does The TSH Value Rise During Pregnancy?

Hi there, Welcome to HCM, I understand your concern, but TSH values being normal is a positive finding not to cause you more anxiety. TSH values do rise in normal and in persons who have had hyperthyroidism treated before. The radioactive iodine destroys the thyroid gland and thyroid supplements are required through out when TSH levels go high, more so in pregnancy. You have linked your first pregnancy with high TSH to normalcy and thinking that your second pregnancy where you miscarried due to Low TSH, but that is not so. 1 in 5 of all pregnancies miscarry even in women without any medical condition so we cannot attribute the lost pregnancy to thyroid. You need to make sure that the TSH levels stay normal in this pregnancy and that you get this checked three monthly atleast. Hope this helps. Regards.