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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Should Be The Normal Blood TSH Level During Pregnancy?

I am 35 years old and two years ago had a total thyroidectomy (benign). I have been on a levoxythrin of 150 mg for the last 6 months and my TSH levels were holding steady close to 1. I am now 5 weeks pregnant. My blood test showed my TSH to be 6.8. My endo has upped my dose to 175 and noted that TSH levels between 5 and 10 are ok in pregnant women. I would like a second opinion about these levels since I've seen other data suggesting that the TSH levels should be under 3.

thank you
Mon, 17 Nov 2014
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Internal Medicine Specialist,  's  Response
Hello,

According to guidelines, the normal TSH level in the first trimester is under 2.5, unless the laboratory gives its own normal range of values. For the second and third trimester the values should be under 3.0. In cases like yours (TSH 6.8), the free T4 should be measured. If it's within normal range then this is called "subclinical hypothyroidism". If it's lower than normal then this is called "overt hypothyroidism".
I hope I've been helpful for you!
If you need more information on this subject, please ask. I'll be glad to help more.

Kind Regards!
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What Should Be The Normal Blood TSH Level During Pregnancy?

Hello, According to guidelines, the normal TSH level in the first trimester is under 2.5, unless the laboratory gives its own normal range of values. For the second and third trimester the values should be under 3.0. In cases like yours (TSH 6.8), the free T4 should be measured. If it s within normal range then this is called subclinical hypothyroidism . If it s lower than normal then this is called overt hypothyroidism . I hope I ve been helpful for you! If you need more information on this subject, please ask. I ll be glad to help more. Kind Regards!