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Mixed Amino Acids, Serum/Plasma — Qualitative

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

A blood test that screens for an abnormal pattern of amino acids, which may help evaluate inherited metabolic disorders and other causes of altered protein metabolism.

Quick summary

["This test screens the amino acid pattern in blood and may identify conditions that affect how the body processes protein."]

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

Key facts at a glance

LOINC
15136-5
Short code
Amino Acids mixC SerPl Ql
Synonyms
Amino Acids mixC SerPl Ql
Category
urine
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

What is this test?

This test examines a mixture of amino acids in serum or plasma, the liquid portion of blood. Amino acids are the building blocks used to make proteins and are also involved in many metabolic processes.

Why might I need this test?

It may be ordered to investigate unexplained symptoms, poor growth, developmental concerns, or episodes of illness that suggest an inherited problem with amino acid metabolism. It may also be used to monitor nutrition or certain treatments.

How is the test performed?

A blood sample is collected, separated into serum or plasma, and analyzed in the laboratory to evaluate the amino acid pattern. The laboratory may use chromatography or another validated method to detect and identify amino acids.

How do I prepare for the test?

Follow the laboratory or clinician's instructions regarding fasting. Diet, supplements, and medicines can affect amino acid results, so tell the healthcare team about supplements, protein drinks, and all current medicines. Avoid making major diet changes unless instructed to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Mixed amino acids, serum/plasma

Frequently asked questions

Does this test measure how much protein I eat?
No. It evaluates the pattern of amino acids in the blood, which can reflect both recent protein intake and how the body is processing protein.
Is fasting required for this test?
Sometimes. Preparation can vary by the specific laboratory method and clinical reason for testing, so follow the instructions provided before your blood draw.
What happens if the result is abnormal?
A clinician may review your diet and medicines and recommend additional laboratory or genetic testing. An abnormal screening result does not by itself establish a specific inherited disorder.
  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