PKU test

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When newborn screening was purely for PKU, one could at least make the argument that no parent should risk a baby's health by refusing the PKU test, although that argument does not obviate the need for parental consent.

Opportunistic testing: the death of informed consent?

The Guthrie BIA test is performed as the procedure published by Guthrie and Susi [1] with PKU test agar and B.

Receiver operating characteristic plots to evaluate Guthrie, Wallac, and Isolab phenylalanine kit performance for newborn phenylketonuria screening

If you wish to forgo the PKU test for your newborn infant, you may claim a religious exemption, sign a paper, and be done.

Question of the Quarter

For example, a PKU test might be negative at 2-6 hours of age, but definitely positive when taken at 12-18 hours of age.