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Tyrosine concentration in serum/plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of tyrosine, an essential amino acid, in your blood. Tyrosine is important for making proteins and hormones, including dopamine and norepinephrine.

Quick summary

["Tyrosine helps support brain function and protein synthesis in your body."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
13381-9
Short code
Tyrosine CSF-mCnc
Synonyms
Tyrosine CSF-mCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Is Tyrosine Used For?

Tyrosine is a building block for several key compounds, including neurotransmitters like dopamine and norepinephrine, which play roles in mood regulation, focus, and energy levels. It also helps produce thyroid hormones and melanin, which affects skin pigmentation.

Why Might You Need This Test?

Doctors may order a tyrosine test if you have symptoms linked to amino acid imbalances, such as neurological issues (e.g., tremors, confusion), thyroid disorders, or conditions affecting protein metabolism. It may also be part of broader metabolic or genetic testing.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is then processed to measure tyrosine concentration using a specialized laboratory technique, often involving high-performance liquid chromatography (HPLC).

What Do Results Mean?

Results are typically reported as a mass concentration (e.g., in micromoles per liter). Abnormal levels may suggest underlying metabolic, genetic, or endocrine conditions, but interpretation depends on clinical context and other test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Tyrosine Level

Frequently asked questions

How often will I need this test?
This test is usually not routine but may be ordered periodically if you have a known condition affecting amino acid metabolism, such as phenylketonuria (PKU) or other genetic disorders. Your doctor will determine the timing based on your medical needs.
What are the normal ranges for tyrosine?
Normal ranges can vary by lab and method. While reference ranges exist, they are often broad and may not apply to everyone. Your doctor will discuss your specific results in relation to your health.
Can lifestyle changes affect tyrosine levels?
Yes, diet and certain medications can influence tyrosine levels. Eating foods rich in tyrosine (e.g., dairy, eggs, nuts) or avoiding excessive protein intake may impact results. Always follow your doctor’s advice regarding dietary or supplement changes.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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