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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What causes high TSH level in a child?

My son was diagnosed with hypothyroidism with his newborn screening. He is now 17 months old and has been on synthroid since he was 3 weeks old. He has had labs done every 6 wks with adjustments on meds.. he is now on 44 mcg and labs now reporting high normal T4 Free and high normal TSH. How is this possible? High T4 free would point to hyperthyroidism, and high TSH points to hypothyroidism... Help please.
Thu, 8 Sep 2016
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Pediatrician 's  Response
the dose of thyroxine is altered mainly on the base of the value of TSH, if it's high that means the dose isn't enough or a Lab error since he doesn't have any symptoms
t4 is normal because of the thyroxine he is taking
but it doesn't seem to be high enough to suppress the TSH
my recommendation is to repeat the tests again and adjust the dose based on the TSH value
I hope this helps
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What causes high TSH level in a child?

the dose of thyroxine is altered mainly on the base of the value of TSH, if it s high that means the dose isn t enough or a Lab error since he doesn t have any symptoms t4 is normal because of the thyroxine he is taking but it doesn t seem to be high enough to suppress the TSH my recommendation is to repeat the tests again and adjust the dose based on the TSH value I hope this helps