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Serum Free Threonine Concentration

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

This test measures the amount of free threonine, an essential amino acid, in your blood serum. Threonine is important for protein synthesis and metabolism.

Quick summary

["Your doctor may order this test to assess amino acid metabolism or evaluate conditions affecting protein balance."]

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

Key facts at a glance

LOINC
47786-9
Short code
Threonine SFr CSF
Synonyms
Threonine SFr CSF
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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms or conditions linked to amino acid disorders, such as metabolic diseases, liver or kidney issues, or unexplained nutritional deficiencies. It could also be part of a broader evaluation for genetic disorders or monitoring certain treatments.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to fast for a few hours before the blood draw if your doctor specifies it. Avoid smoking or consuming caffeine for 30 minutes before the test to ensure accurate results.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm using a small needle. The process usually takes a few minutes, and you may feel a brief pinch. The blood sample will be sent to a lab for analysis of free threonine levels.

What the Results Mean

Results are compared to standard reference ranges for free threonine. Abnormal levels may indicate underlying metabolic, genetic, or organ-related conditions that require further medical evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Free Threonine Level

Frequently asked questions

What could cause elevated free threonine levels?
Elevated levels may be associated with certain metabolic disorders, liver disease, kidney dysfunction, or conditions affecting amino acid metabolism. Your doctor will consider your full clinical picture and other test results to determine the cause.
What could cause low free threonine levels?
Low levels might suggest malnutrition, severe liver or kidney disease, or genetic disorders impairing amino acid processing. Chronic illnesses, certain medications, or malabsorption syndromes could also play a role.
Do I need to do anything special if my results are abnormal?
If your results are abnormal, your doctor will discuss next steps, which may include additional tests, dietary adjustments, or treatment tailored to your condition. Follow their guidance closely and report any new symptoms promptly.
  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