What are the reasons for high serum thyroid function?

Patient's question:

Newborn foot blood screening showed a positive TSH value. Then at 29 days, a retest of the 6 serum thyroid function tests revealed two elevated values. Could you help explain the results?

Doctor's answer:

According to your description, newborns cannot express themselves on their own and require extra attention from the mother. If the newborn's TSH levels are high again, it is usually self-limiting. If it cannot resolve on its own, the mother should take the child to the hospital for a thorough examination. Since the TSH receptor antibodies that cause neonatal hyperthyroidism originate from the mother and are not produced by the child itself, these antibodies will gradually degrade over time, and the symptoms of hyperthyroidism will also gradually subside. Most cases resolve on their own within 1 to 3 months after birth, without any complications or leaving any long-term effects. In rare cases where it does not resolve on its own, appropriate treatment methods should be promptly administered. If the condition does not improve, it is necessary to seek immediate medical attention at the hospital. Severe hyperthyroidism may interfere with the child's intellectual development and growth.

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