A neonate with abnormal newborn screening showing low T4 and elevated TSH should be managed by which step?

A neonate with abnormal newborn screening showing low T4 and elevated TSH should be managed by which step?

• A. Consult with the physician, and repeat the tests
• B. Discharge the neonate and follow up later
• C. Start thyroxine immediately
• D. Inspect for hypothyroidism signs

Answer: (A)

Abnormal newborn thyroid screening with low T4 and high TSH signals a possible primary congenital hypothyroidism, a condition that can affect neurodevelopment if not identified and treated promptly. Because the screen is screening, not diagnostic, the correct next step is to involve a physician and obtain confirmatory testing rather than assuming treatment or discharge. Repeating the tests helps verify the result, rule out lab error, and distinguish true hypothyroidism from a transient or false-positive finding. If hypothyroidism is confirmed, therapy with thyroid hormone is started urgently, but the initial move is to confirm with appropriate testing and physician coordination. Simply discharging the baby or relying on signs alone is insufficient, since signs can be subtle or absent in the newborn period.

Abnormal newborn thyroid screening with low T4 and high TSH signals a possible primary congenital hypothyroidism, a condition that can affect neurodevelopment if not identified and treated promptly. Because the screen is screening, not diagnostic, the correct next step is to involve a physician and obtain confirmatory testing rather than assuming treatment or discharge. Repeating the tests helps verify the result, rule out lab error, and distinguish true hypothyroidism from a transient or false-positive finding. If hypothyroidism is confirmed, therapy with thyroid hormone is started urgently, but the initial move is to confirm with appropriate testing and physician coordination. Simply discharging the baby or relying on signs alone is insufficient, since signs can be subtle or absent in the newborn period.