Tyrosine concentration (serum/plasma)
This test measures the amount of tyrosine, an amino acid important for producing proteins and neurotransmitters like dopamine and norepinephrine. Levels may be checked if you have symptoms of metabolic disorders or if other tests suggest amino acid imbalances.
["Tyrosine helps your body make key proteins and brain chemicals; abnormal levels may signal metabolic or genetic conditions."]
Key facts at a glance
- LOINC
- 30069-9
- Short code
- Tyrosine Amn-sCnc
- Synonyms
- Tyrosine Amn-sCnc
- Category
- chemistry
- Sample
- fluid
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 2-5 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h
- Hemolysis max
- 300
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have signs of metabolic disorders, such as unusual fatigue, weakness, or neurological symptoms. It may also be part of a broader evaluation for conditions like phenylketonuria (PKU) or other amino acid disorders, especially in newborns or those with genetic testing results.
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if your test is part of a metabolic panel. Bring any medications or supplements you’re taking, as they could affect results.
How the Test Is Performed
A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but it usually doesn’t cause significant discomfort. The blood is then sent to a lab for analysis.
What the Results Mean
Results are compared to a reference range, which can vary by lab. Low levels might indicate metabolic disorders, while high levels could suggest liver disease or other conditions. Your provider will discuss the results in the context of your overall health.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal tyrosine levels can signal underlying metabolic or genetic conditions, such as tyrosinemia or other amino acid disorders. Low levels may require dietary adjustments or medical treatment, while high levels could prompt further evaluation for liver or kidney issues. Always consult your healthcare provider for interpretation.
Short name
Tyrosine Level
Frequently asked questions
What causes tyrosine levels to be tested?
What might affect my tyrosine test results?
Do I need to prepare for this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy