During normal routine of newborn screening, there are a low thyroxin level with normal TSH. The patient was born by cesarean section due to breach presentation. During the pregnancy, the mother took acetaminophen intermittently for low back pain. Examination of the newborn shows no abnormal findings. Which of the following is the most likely cause of the patient's abnormal thyroid function tests?

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Quizplus · Accepted Answer

Eductional Objective: Thyroxine-binding globulin deficiency is a benign disorder characterized by low total thyroxine (T4) and normal free T4 and TSH levels. Patients are euthyroid and do not require treatment.

During Normal Routine of Newborn Screening, There Are a Low