A 2-year-old boy, who recently immigrated from a country without a comprehensive newborn screening program, presents with global developmental delay, intractable seizures, and hepatosplenomegaly. An MRI of the brain reveals white matter disease. The pediatrician is considering treatable inborn errors of metabolism and wants to follow the Treatable Intellectual Disability Endeavor (TIDE) protocol. Which set of Tier 1 screening tests would be most appropriate to order first?