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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 other essential proteins and hormones.

Quick summary

["Tyrosine helps your body produce key proteins and hormones, and this test checks your blood levels for medical evaluation."]

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

Key facts at a glance

LOINC
47795-0
Short code
Tyrosine SFr SerPl
Synonyms
Tyrosine SFr SerPl
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 This Test Might Be Ordered

Your healthcare provider may order this test if they suspect a metabolic disorder, such as tyrosineemia (a rare genetic condition affecting amino acid metabolism). It could also be part of a broader evaluation for conditions affecting protein synthesis or hormone function.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it involves drawing blood. Wear comfortable clothing and plan to stay near the testing site for a short time.

During the Test

A healthcare professional will insert a small needle into a vein in your arm to draw blood. You may feel a slight pinch, but the procedure is quick. The blood sample is then sent to a lab for analysis.

After the Test

You can typically resume normal activities immediately. Apply gentle pressure to the insertion site to help stop any bleeding. If you experience dizziness or excessive bruising, contact your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Tyrosine Level

Frequently asked questions

What does a low tyrosine level mean?
A low tyrosine level may suggest a metabolic disorder, such as tyrosineemia, or conditions affecting protein metabolism. Your provider will discuss next steps based on your overall health and test results.
What does a high tyrosine level mean?
High tyrosine levels could be linked to liver disease, certain genetic disorders, or other metabolic issues. This result may need further evaluation to determine the cause and appropriate treatment.
Is fasting required for this test?
Fasting may be recommended depending on the test type, but it’s not always required. Always follow your provider’s instructions before the test.
  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