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Serum phenylalanine level before the initiation of treatment
| Timing | n | Serum phenylalanine, mg/dL | |
|---|---|---|---|
| Mean (SD) | Min, Max | ||
| At newborn screening | 77 | 8.53 (3.86) | 2.07, 19.59 |
| At pre‐study visit | 83 | 9.66 (6.39) | 0.48, 36.80 |
| Before BH4 loading test | 84 | 12.00 (7.06) | 2.99, 40.00 |
BH4, tetrahydrobiopterin; SD, standard deviation.
