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Alpha-1-Microglobulin, Serum/Plasma — Turbidimetry, Mass Concentration

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

This blood test measures alpha-1-microglobulin, a small protein that is filtered by the kidneys. It can provide information about kidney function and protein handling.

Quick summary

["The result can help assess how well the kidneys filter and handle small proteins."]

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

Key facts at a glance

LOINC
110319-1
Short code
A1 Microglob Msmt Ur
Synonyms
A1 Microglob Msmt Ur
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?

Alpha-1-microglobulin is a small protein that circulates in the blood and is normally filtered by the kidneys. This test measures its concentration in serum or plasma using a turbidimetric method.

Why might I need this test?

This test may be used as part of an evaluation of kidney function, particularly when there is concern about impaired filtration or abnormal handling of proteins. It may also be used to monitor people with certain kidney conditions.

How is the test performed?

A blood sample is collected, and the serum or plasma is tested in the laboratory. Turbidimetry measures how much light is scattered by the protein in the sample.

How do I prepare for the test?

No special preparation is usually required. Follow any instructions from your healthcare professional, and tell the laboratory if you have a known kidney condition or are taking medicines that may affect kidney function.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Alpha-1-Microglobulin

Frequently asked questions

What does alpha-1-microglobulin measure?
It measures the amount of a small protein in blood that is normally handled by the kidneys.
Is this the same as a urine protein test?
No. This test measures alpha-1-microglobulin in serum or plasma; a urine protein test measures protein in urine and answers a different clinical question.
Can I interpret this result on my own?
A single result does not usually identify a specific condition by itself. Your healthcare professional should compare it with your other test results and clinical information.
  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