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Unspecified Analyte — Mass Concentration

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

The code identifies a mass-concentration measurement, but the substance being measured and the specimen type are not clearly encoded.

Quick summary

["This code represents the amount of a substance per unit volume, but the substance must be confirmed from the full laboratory report."]

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

Key facts at a glance

LOINC
13384-3
Short code
AAA Amn-mCnc
Synonyms
AAA Amn-mCnc
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?

A mass-concentration test measures the amount of a substance in a specified volume of a patient sample, such as serum, plasma, or urine. The abbreviated code provided does not clearly identify the substance, specimen, or testing method, so the full laboratory report should be checked for the exact test name.

Why might I need this test?

Concentration testing may be used to evaluate the amount of a specific substance in blood or another specimen. The reason for testing depends on the substance being measured, which should be confirmed with the ordering clinician or laboratory.

How is the test performed?

A laboratory analyzes the submitted specimen and calculates the amount of the target substance relative to the sample volume. The specific instrument or laboratory method cannot be determined from this code.

How do I prepare for the test?

Preparation depends on the substance and specimen involved. Until the complete test name is confirmed, follow the instructions provided by the laboratory or healthcare professional and ask whether fasting or another preparation is required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What does mass concentration mean?
It means the amount of a measured substance per unit volume of sample. Depending on the substance, results may be reported in units such as milligrams per deciliter or grams per liter.
Can I identify the substance from this code alone?
No. The analyte abbreviation in this code is ambiguous and does not clearly identify the substance or specimen. Check the full test name on the laboratory report or contact the laboratory for confirmation.
Do I need to fast before this test?
There is no universal fasting requirement for a mass-concentration test. Preparation can vary by the substance and specimen, so follow the specific instructions given for your ordered test.
  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