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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 serum. It may be used in specialized metabolic or nutritional assessments.

Quick summary

["Free threonine helps support protein synthesis and cellular function; abnormal levels may indicate metabolic or genetic conditions."]

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

Key facts at a glance

LOINC
47788-5
Short code
Threonine SFr SerPl
Synonyms
Threonine 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 recommend this test if you have symptoms or conditions linked to amino acid metabolism, such as genetic disorders affecting amino acid transport or metabolism. It could also be part of a broader evaluation for nutritional deficiencies or metabolic diseases.

What to Expect Before the Test

No special preparation is typically required, but you may be asked to fast for a few hours before the blood draw. Wear comfortable clothing and plan for the test to be done at a clinic or lab.

How the Test Works

A small sample of your blood is drawn and sent to a lab. The lab uses a specialized method (likely immunoassay or chromatography) to measure free threonine levels in your serum.

What the Results Mean

Results are compared to a reference range specific to your lab. Abnormal levels may suggest metabolic imbalances, genetic disorders, or other health conditions that require further evaluation by your healthcare provider.

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 abnormal results?
Abnormally high or low free threonine levels may indicate underlying conditions such as amino acid disorders, liver or kidney disease, or certain genetic syndromes. Always discuss results with your healthcare provider for personalized interpretation.
How often should I get this test?
This test is usually ordered as part of a specific diagnostic evaluation rather than as a routine screening test. Follow your healthcare provider’s recommendations for follow-up testing.
Can diet affect this test?
Dietary intake of threonine may influence results, so fasting guidelines are typically followed to ensure accurate measurements. Avoid consuming large amounts of protein-rich foods before the test if instructed.
  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