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Tyrosine concentration in serum/plasma

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

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

Quick summary

["Tyrosine helps your body produce key hormones and proteins; low levels may signal metabolic or liver issues."]

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

Key facts at a glance

LOINC
47796-8
Short code
Tyrosine SFr DBS
Synonyms
Tyrosine SFr DBS
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like fatigue, weight changes, or hormonal imbalances. It can also help diagnose conditions affecting amino acid metabolism, such as tyrosinemia or liver disorders.

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 draw if your blood is collected early in the morning. Wear a loose shirt for easy access.

What Happens During the Test?

A healthcare professional will insert a small needle into a vein in your arm to draw blood. The process is quick and typically causes only mild discomfort. The blood sample is then sent to a lab for analysis.

What Do Results Mean?

Results are compared to a reference range for healthy individuals. Abnormal levels may indicate metabolic disorders, liver disease, or other health concerns that require further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Tyrosine Level

Frequently asked questions

What could cause abnormal tyrosine levels?
High tyrosine levels may be linked to liver disease, certain medications, or metabolic disorders like tyrosinemia. Low levels could suggest amino acid metabolism disorders or conditions affecting protein synthesis.
How often should I get this test?
This test is usually ordered as needed, depending on your symptoms or medical condition. Your doctor will determine the best timing and frequency based on your care plan.
Is there anything I should avoid before the test?
Avoid excessive alcohol or certain medications (like some antibiotics or diuretics) that may affect blood composition. Follow any fasting instructions provided by your provider.
  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