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Tyrosine concentration in blood (serum/plasma)

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

This test measures the amount of tyrosine, an amino acid found in your blood. Tyrosine is essential for producing other important compounds, including hormones and neurotransmitters.

Quick summary

["Tyrosine levels help assess metabolic health and potential deficiencies."]

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

Key facts at a glance

LOINC
105266-1
Short code
Tyrosine dis multi anl Bld/T
Synonyms
Tyrosine dis multi anl Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is Tyrosine?

Tyrosine is one of the 20 standard amino acids that make up proteins. Your body uses it to create hormones like adrenaline and thyroid hormones, as well as neurotransmitters like dopamine and norepinephrine. It also plays a role in skin pigmentation and energy metabolism.

Why Is This Test Done?

Doctors may order a tyrosine test if you have symptoms like fatigue, weight changes, or skin issues that suggest metabolic disorders. It can also be part of evaluating conditions such as phenylketonuria (a rare genetic disorder) or other amino acid imbalances.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure tyrosine levels using a specialized method, often an immunoassay or enzymatic technique.

What Are Possible Results?

Results are typically reported as a concentration value (e.g., milligrams per deciliter). Interpretation depends on your health status, age, and other factors. Abnormal results may require further testing or evaluation by a healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Tyrosine Level

Frequently asked questions

What Does an Abnormal Result Mean?
Elevated tyrosine levels might indicate conditions like liver disease, certain cancers, or metabolic disorders. Low levels could suggest deficiencies or genetic disorders affecting amino acid metabolism. Always discuss results with your doctor.
How Often Should I Get This Test?
This test is usually not a routine screening. Your doctor will order it only if they suspect a specific condition or need to monitor a known metabolic issue.
Can I Prepare for This Test?
No special preparation is needed, but avoid heavy meals before the blood draw. If you’re on medications, let your doctor know to ensure they don’t affect results.
  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