The Nurse Provides Instructions to the Parent of a Newborn

The nurse provides instructions to the parent of a newborn to bring the infant to the well -baby clinic for a phenylketonuria (PKU) rescreening blood test. The parent brings the infant to the clinic, and the blood test is drawn. The results of the test indicate a serum phenylalanine level of 1.0 mg/dL. The nurse interprets these results as:

A) Positive
B) Negative
C) Inconclusive
D) Requiring rescreening at age 6 weeks