The Guthrie test is used to diagnose:
  1. Galactosemia
  2. Ornithine transcarboxylase deficiency
  3. Glycogen storage disase
  4. Phenylketonuria
Explanation
Answer: D - The Guthrie test is a blood assay used to diagnose phenylketonuria in newborn infants. It detects bacterial growth in an agar culture that is due to the presence of excess phenylalanine.
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