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Table 1 Recommended ranges for plasma Phe values and frequency of blood sampling in the Netherlands

From: "MY PKU": increasing self-management in patients with phenylketonuria. A randomized controlled trial

Age Plasma Phe (μmol/L) Blood sampling
First year 120-360 weekly
1-4 120-360 every other week
4-12 120-360 monthly
12-15 120-600 monthly
> 15 120-600 monthly