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Alpha-Amino Acids, Urine — Qualitative

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

A qualitative urine test that screens for elevated amino acids, often used in newborn screening or evaluation of possible inherited metabolic disorders.

Quick summary

["An abnormal result may indicate a condition that affects how the body processes amino acids and warrants review by a healthcare professional."]

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

Key facts at a glance

LOINC
16338-6
Short code
AAA Ur Ql
Synonyms
AAA Ur Ql
Category
liver
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

This test examines urine for the presence of an abnormal amount or pattern of amino acids. Amino acids are building blocks of proteins that the body normally breaks down and uses.

Why might I need this test?

It may be used during newborn screening or when symptoms suggest an inherited condition that affects how the body processes amino acids. It can also help investigate unexplained developmental or metabolic symptoms.

How is the test performed?

A urine sample is collected and examined for amino acids. The laboratory may analyze the urine using methods that identify and compare the amino acid pattern.

How do I prepare for the test?

Follow the testing center's instructions for urine collection, timing, and storage. Do not start or stop medicines or restrict food or drink unless your clinician specifically instructs you to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

An abnormal result may indicate that unusually high amounts of certain amino acids are being lost in the urine. This can occur with certain inherited metabolic disorders or, less commonly, with conditions that affect kidney function. The result should be interpreted alongside symptoms, medical history, and other laboratory tests.

Short name

Urine amino acids screen

Frequently asked questions

Does an abnormal result mean I have a metabolic disorder?
Not necessarily. Abnormal urine amino acids can have several causes, so the result usually requires clinical review and sometimes additional testing.
Is this the same as a serum amino acid test?
No. This test examines amino acids in urine, while a serum amino acid test measures them in blood. The two tests may be used together.
Will I receive specific reference ranges?
Because this is a qualitative screening test, its interpretation depends on the laboratory method and the clinical context. Your healthcare professional can explain the result and any recommended follow-up.
  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