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Tyrosine concentration in serum

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

This test measures the amount of tyrosine, an essential amino acid, in your blood serum. Tyrosine plays a role in producing hormones like thyroid hormones and neurotransmitters.

Quick summary

["Tyrosine helps regulate hormones and brain function; low levels may signal metabolic or hormonal imbalances."]

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

Key facts at a glance

LOINC
47797-6
Short code
Tyrosine SFr Spec
Synonyms
Tyrosine SFr Spec
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 to evaluate metabolic health, assess conditions like phenylketonuria (a rare genetic disorder), or monitor treatment for conditions affecting amino acid metabolism. It can also be part of broader metabolic screening.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours if your test involves a blood draw. Wear comfortable clothing and plan to stay near the testing site for a short time.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but it typically doesn’t cause significant discomfort. The blood sample is then sent to a lab for analysis.

What Do Results Mean?

Results are interpreted by your healthcare provider based on your overall health, medical history, and symptoms. Abnormal levels may indicate metabolic disorders, liver disease, or other conditions requiring further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Tyrosine Level

Frequently asked questions

What causes tyrosine levels to be abnormally high?
High tyrosine levels can result from metabolic disorders (e.g., phenylketonuria), liver disease, or certain cancers. Your doctor may also investigate if you have symptoms like fatigue, weight changes, or neurological issues.
What causes tyrosine levels to be abnormally low?
Low tyrosine levels may occur with thyroid disorders (like hypothyroidism), malnutrition, or certain genetic metabolic conditions. If you notice symptoms like weakness or mood changes, talk to your doctor.
How often should I get this test?
Frequency depends on your health status. Your doctor will determine if regular monitoring is needed, especially if you have a history of metabolic disorders or related conditions.
  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