For people with PKU, the symptoms of high or unstable blood Phe levels can occur slowly over time and can be difficult to recognise. Use the tool below to see if you or a loved one has been experiencing symptoms of PKU.

This diary should not be used as a diagnostic tool for PKU, but as a discussion guide for visits to your PKU clinic.

Select your role in the drop down below, respond to the questions, and click SUBMIT to view your results.