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Urine Analyte — Mass Concentration

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

This test measures the concentration of a substance in urine by determining its mass per unit volume. The specific substance cannot be identified confidently from the abbreviation provided.

Quick summary

["The result shows how much of the measured substance is present per unit volume of urine."]

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

Key facts at a glance

LOINC
16340-2
Short code
A-AIB Ur-mCnc
Synonyms
A-AIB Ur-mCnc
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?

A urine mass concentration test measures the amount of a particular substance in a given volume of urine. It may be used to evaluate substances filtered by the kidneys or released into the urine.

Why might I need this test?

Your clinician may order this test to investigate possible kidney conditions, monitor an existing condition, or evaluate a substance associated with symptoms such as unusual urinary changes. The reason for testing depends on the specific substance being measured.

How is the test performed?

A urine sample is collected and analyzed in the laboratory to determine the mass of the substance per unit volume. Collection method and timing may vary according to the test instructions provided by your clinician.

How do I prepare for the test?

Fasting is usually not required, but you should follow the urine collection instructions exactly. Your clinician may request a first-morning sample, a clean-catch sample, or collection over a specified period.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine analyte mass concentration

Frequently asked questions

Does this test require a blood sample?
No. This test is performed using a urine sample, although related blood tests may sometimes be ordered for comparison.
Why might a 24-hour urine collection be requested?
A 24-hour collection measures the substance across a full day, which can provide a more complete picture than a single sample. Follow the provided timing and collection instructions carefully.
What does a high or low result mean?
It means the amount of the substance per unit volume of urine differs from the expected range. The possible cause depends on the specific substance, symptoms, medications, and other laboratory 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