A 5-Month-Old Boy Is Brought to the Emergency Department Due

A 5-month-old boy is brought to the emergency department due to poor feeding, weakness, and complete loss of extremity muscle tone.  Vaccinations are up to date, and there is no significant medical history.  The patient receives formula as his sole source of nutrition except for occasional fruit juice and honey.  Which of the following is most likely to confirm the diagnosis in this patient?

A) Blood test for liver enzymes
B) Blood test for viral titers
C) Stool test for bacterial toxins
D) Stool test for occult blood
E) Urine test for amino acids
F) Urine test for glucose and ketones

Correct Answer:

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