A 6-month-old boy is brought to the physician to establishe a health care after moving to a new city. Since birth, he has taken levothyroxine because he was diagnosed with congenital hypothyroidism. His mother states that he passes stools 3 to 4 times per week. He is exclusively breast fed and has not yet received any routine vaccinations. There is no family history of serious illness. He also takes daily vitamin D and iron supplements. . He is at the 40th percentile for length and the 60th percentile for weight. Thyroid function testing at age 4 months was normal. Results of routine follow-up laboratory testing are as follows: Which of the following is the most likely mechanism for this patient's abnormal thyroid function tests?

Question

A 6-month-old boy is brought to the physician to establishe a health care after moving to a new city. Since birth, he has taken levothyroxine because he was diagnosed with congenital hypothyroidism. His mother states that he passes stools 3 to 4 times per week. He is exclusively breast fed and has not yet received any routine vaccinations. There is no family history of serious illness. He also takes daily vitamin D and iron supplements. . He is at the 40th percentile for length and the 60th percentile for weight. Thyroid function testing at age 4 months was normal.  Results of routine follow-up laboratory testing are as follows:  Which of the following is the most likely mechanism for this patient's abnormal thyroid function tests?

Quizplus · Accepted Answer

Eductional Objective: Coadministration of levothyroxine with various foods (eg, soy products) and certain medications (eg, iron, calcium, antacids) can lead to poor intestinal absorption of levothyroxine and symptoms of hypothyroidism while on therapy.

A 6-Month-Old Boy Is Brought to the Physician to Establishe