: Lysozyme, IgG4, Mass Concentration, Measurement
: This is a laboratory measurement that combines assessment of lysozyme and immunoglobulin G4 (IgG4) in a specimen, reported as a mass concentration. It is used to help evaluate certain inflammatory and immune-related conditions.
[": Lysozyme and IgG4 testing can support evaluation of specific immune and inflammatory disorders, but results must be interpreted by a clinician in context."]
Key facts at a glance
- LOINC
- 97956-7
- Short code
- Lysozyme IgG4-mCnc
- Synonyms
- Lysozyme IgG4-mCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
: What Is Being Measured
: The test measures the amount of lysozyme and immunoglobulin G4 (IgG4) present in the sample, expressed as a mass concentration. Lysozyme is an enzyme produced by certain immune cells, and IgG4 is a subtype of antibody involved in immune responses.
: Why It May Be Ordered
: A clinician may order this testing to help investigate conditions associated with abnormal immune cell activity or elevated IgG4-related disease. It is typically part of a broader evaluation rather than a stand-alone diagnostic test.
: How the Test Is Performed
: A blood or other appropriate specimen is collected and sent to a laboratory, where specialized methods measure the concentration of each analyte. The exact method used depends on the performing laboratory.
: How to Interpret Results
: Results are reported as concentrations and should be compared with the reference intervals provided by the performing laboratory. Because values can be affected by many factors, interpretation requires clinical context and sometimes additional testing.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
: Lysozyme and IgG4 measurements can be useful supportive markers in the evaluation of immune-mediated and inflammatory conditions, including IgG4-related disease. However, they are not diagnostic on their own, and results should always be interpreted alongside symptoms, physical examination, imaging, and other laboratory findings.
Short name
: NONE
Frequently asked questions
: Does this test diagnose a specific disease?
: Do I need to fast before this test?
: Can medications affect the results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy