This toolkit for implementing nutrition management guideline is a suggested framework for providing nutrition care to individuals with phenylketonuria (PKU). It may not always be appropriate to use all aspects of this toolkit. Individual circumstances and complicating conditions must be taken into consideration. The clinical judgment of the health care provider, and patient preferences and values dictate management decisions. This toolkit is provided to assist with the implementation of the PKU management guideline with the express understanding that it does not establish or specify particular standards of care, whether legal, medical, or other.