Please assess the completion status of the following clinical trial:

Trial Title: Nutritional and Neurotransmitter Changes in PKU Subjects on BH4

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: COHORT
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Diagnosed with PKU~* ability to provide informed consent (or have legal guardian who can provide informed consent)~* at least 4 years of age~* planning on trying BH4 treatment~Exclusion Criteria:~* Pregnant~* unable to provide informed consent~* less than 4 years of age~* currently taking BH4

- Gender: ALL
- Minimum Age: 4 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- PKU subjects - baseline (Type: None): Male and female subjects with PKU at baseline starting KuvanTM therapy.

Based on this trial design, predict the completion outcome and termination type (if applicable).