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Unidentified Analyte, Substance Concentration

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

This code indicates a substance concentration measurement, but the analyte and specimen cannot be reliably identified from the abbreviation.

Quick summary

["The test name must be confirmed with the ordering laboratory or clinician."]

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

Key facts at a glance

LOINC
26909-2
Short code
AAA Amn-sCnc
Synonyms
AAA Amn-sCnc
Category
liver
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 is this test?

This laboratory code refers to measuring the concentration of a substance in a sample. The abbreviated code does not clearly identify either the substance or the specimen, so the full test name should be verified before results are interpreted.

Why might I need this test?

Substance concentration tests may be ordered to evaluate a particular hormone, vitamin, medication, chemical, or other marker. The reason for testing depends on the substance actually measured and the clinical situation.

How is the test performed?

A laboratory analyzes the submitted sample using a validated measurement method. Because the specimen is not identifiable from this code, the laboratory instructions should determine which sample is required.

How do I prepare for the test?

Preparation depends on the substance and specimen involved. Follow the instructions provided by the ordering clinician or laboratory, including any fasting, timing, or medication requirements.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What substance does this test measure?
The abbreviated code does not reliably identify the substance. Contact the ordering clinician or laboratory to confirm the full test name before using the result for a health decision.
What type of sample is required?
The specimen is not clearly encoded in this abbreviation. Check your test order or collection instructions for details about the required sample and how it should be collected.
Do I need to fast before this test?
Fasting requirements depend on the specific analyte and specimen. Follow the preparation instructions from the ordering clinician or laboratory, and ask if you are unsure.
  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