Table 3. Target blood phenylalanine concentrations (µmol/L) as recommended for treatment of PKU in different countries.

Age group	United States	UK	Japan	Turkey	China
< 2 years	120 – 360	120 – 360	120 – 240	60 – 240	120 –
2–6 years			120 – 360
7–9 years		120 – 480	180 – 360
10–12 years			180 – 480
13–15 years	120 – 600	120 – 700	180 – 600
> 16 years	120 – 900		180 – 900
Incidence	1/15,000	1/10,000	1/70,000	1/4,000	1/11,144