Serum or plasma mass concentration of immunoglobulin G (IgG) fragments or related proteins (e.g., free light chains or specific subclasses)
This test measures the amount of certain IgG-related proteins in your blood, which may help identify conditions affecting antibody production or immune system function.
["Assists in diagnosing immune disorders or monitoring protein-related conditions."]
Key facts at a glance
- LOINC
- 73747-8
- Short code
- KLH IgM Ser-mCnc
- Synonyms
- KLH IgM Ser-mCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 1.5
- Ref high
- 9
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 83002
- 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 This Test Measures
IgG is a key part of your immune system, but this test focuses on specific fragments or subclasses of IgG or related proteins, such as free light chains. These can be elevated in conditions like multiple myeloma, certain autoimmune diseases, or after immune system stimulation.
Why It Might Be Ordered
Your healthcare provider may order this test if you have symptoms like frequent infections, unexplained fatigue, or signs of immune dysfunction. It could also be used to monitor treatment responses in conditions affecting protein levels in the blood.
Common Conditions Affecting Results
High levels may suggest conditions like multiple myeloma, certain lymphomas, or severe infections. Low levels could indicate immune deficiencies or chronic diseases that deplete proteins. The test may also be used in research or specialized diagnostics.
Sample Collection and Preparation
A blood sample is drawn from a vein, typically in your arm. The blood is processed to separate serum or plasma, which is then analyzed for the specific protein fragments or concentrations.
Reference range
Follicular: 1.5-9.0 mIU/mLN/A
For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
IgG-related protein mass concentration
Frequently asked questions
How long does it take to get results from this test?
What does a high or low result mean?
Can diet or medications affect this test?
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.
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