An essential amino acid and precursor to tyrosine and neurotransmitters.
Phenylalanine is an essential amino acid that comes from food. It is a building block for proteins and the source of tyrosine, which in turn makes dopamine, adrenaline and thyroid hormones. Your body converts most surplus phenylalanine into tyrosine.
Plasma phenylalanine is part of a full amino acid profile. The best known reason to measure it is phenylketonuria, an inherited condition where phenylalanine builds up. Raised levels are read together with tyrosine and the rest of the profile.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
Adult fasting plasma, guidance only:
| Analyte | Typical adult range (µmol/L) |
|---|---|
| Phenylalanine | 40 to 85 |
Ranges vary by laboratory and assay and are read as part of the full amino acid profile.
Results are affected by recent diet, recent protein intake, fasting state and the time of day the sample is taken.
Read as part of the full plasma amino acid profile.
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