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Serum Free Threonine Concentration

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

This test measures the amount of the amino acid threonine in your blood serum, which is part of protein metabolism and plays a role in cell growth and tissue repair.

Quick summary

["Threonine levels can help assess protein balance or metabolic conditions."]

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

Key facts at a glance

LOINC
47787-7
Short code
Threonine SFr Amn
Synonyms
Threonine SFr Amn
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What Does This Test Measure?

Threonine is an essential amino acid that your body uses to build proteins. This test specifically looks at the free (unbound) form of threonine in your blood serum, which can be influenced by dietary intake, metabolism, and certain medical conditions.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms or conditions linked to amino acid imbalances, such as metabolic disorders, liver disease, or kidney problems. It can also be part of broader metabolic screening or research studies.

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 if your test involves fasting-related interpretation. Bring any medications or supplements you take daily.

What to Expect During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch or discomfort, but it usually lasts only a few seconds. The process takes about 5 minutes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal threonine levels may indicate underlying metabolic issues, such as amino acid disorders, liver or kidney dysfunction, or conditions affecting protein synthesis. While threonine itself is less commonly monitored than other amino acids, elevated or low levels can sometimes reflect broader metabolic health concerns that require further evaluation.

Short name

Free Threonine Level

Frequently asked questions

Why might my threonine levels be checked?
Your doctor may check threonine levels if you have symptoms like fatigue, muscle weakness, or unexplained weight changes, or if you have a known metabolic disorder. It may also be part of a broader metabolic panel or research study.
What do my threonine results mean?
Results are not typically interpreted alone. Your doctor will compare your levels to your overall health, other test results, and symptoms. If results are outside expected ranges, further testing or evaluation may be needed to understand the cause.
Can diet affect threonine levels?
Yes, diet plays a role. Threonine is found in many foods, including meat, dairy, eggs, and legumes. Eating a balanced diet with adequate protein can help maintain normal levels, but dietary changes alone won’t replace medical evaluation for abnormal results.
  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