Why Must Neonatal PKU Testing Be Performed by Heel Stick

question 17

Multiple Choice

Why must neonatal PKU testing be performed by heel stick rather than venipuncture?

• A) Phenylalanine levels are different between veins and capillaries.
• B) Dermal puncture is easier.
• C) Plastic in the collection tubes interferes with testing.
• D) Metal in the needle interferes with testing.

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