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Immunoglobulin G (IgG) 24-Hour Urinary Excretion Rate

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

This test measures how much Immunoglobulin G, a type of antibody, appears in your urine over a 24-hour period. It helps assess kidney function and potential IgG-related conditions.

Quick summary

["This test helps evaluate kidney health and IgG excretion in urine."]

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

Key facts at a glance

LOINC
26871-4
Short code
IgA 24h Ur-mCnc
Synonyms
IgA 24h Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like protein in urine, kidney disease, or if they suspect abnormal IgG levels in your body. It can also help diagnose conditions like IgA nephropathy or monitor kidney function in certain genetic disorders.

What Does the Test Involve?

You’ll collect all your urine over a full 24-hour period, typically starting after you wake up. The urine is then sent to the lab for analysis to measure IgG concentration.

What Are Common Results and Interpretation?

Results are not provided as a single number but as a rate (amount of IgG excreted per day). Your healthcare provider will compare this to expected ranges for your age and health status to determine if results are normal or if further evaluation is needed.

How Is This Test Different from Other IgG Tests?

Unlike blood tests for IgG levels, this test specifically looks at IgG in urine. It helps differentiate between IgG filtered by the kidneys and IgG that may be leaking into urine due to kidney issues or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal IgG excretion in urine can signal kidney problems, such as IgA nephropathy or other glomerular diseases. High levels may also indicate immune system activity or certain genetic disorders. Your provider will use this test alongside other tests to diagnose or monitor conditions affecting kidney function or IgG metabolism.

Short name

IgG Urine Output

Frequently asked questions

What does a high IgG urinary excretion rate mean?
A high IgG urinary excretion rate may suggest kidney issues, such as nephropathy, or conditions affecting IgG production or clearance. It’s important to discuss your results with your healthcare provider to understand the full context.
What if my urine test shows normal IgG levels?
If your IgG urinary excretion rate is within expected ranges, it generally indicates normal kidney function and typical IgG handling. However, your provider may still recommend follow-up tests or monitoring if you have ongoing symptoms or risk factors.
Can I take medications before this test?
Some medications, especially those affecting kidney function or urine production, may influence results. Always inform your healthcare provider about all medications, supplements, or recent treatments before this 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