A healthy result should fall into the range 38 - 110 µmol/L.

Tyrosin is the non-essential amino acid precursor for dopamine, norepinephrine and epinephrine. Tyrosine hydroxylase converts tyrosine into the dopamine precursor L-DOPA; BH4, Vitamin D and iron are cofactors for that enzymatic activity.

Tyrosine (Plasma) result calculator

insert the value from you Tyrosine (Plasma) test result.

What does it mean if your Tyrosine (Plasma) result is too low?

  • Implicated in depression, hypothyroidism, blood pressure disorders. If phenylalanine is normal or high, iron, Vitamin C, and Niacin supplementation may help to convert phenylalanine to tyrosine. 
  • Low tyrosine relative to phenylalanine could also suggests that tetrahydrobiopterin (BH4) might be low. 

What does it mean if your Tyrosine (Plasma) result is too high?

  • Increased tyrosine may exacerbate migraine headaches and hyperthyroid conditions.
  • Elevated tyrosine levels may occur due to supplementation (phenylalanine or tyrosine), heritable enzyme defects, or liver disease.
  • High levels may indicate an inability to utilize tyrosine properly, perhaps because of low levels of enzyme co-factors such as iron, copper, iodine, B6, and vitamin C. 

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