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Serum or plasma mass concentration of immunoglobulin G (IgG) fragments or related breakdown products

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

This test measures certain fragments or breakdown products of immunoglobulin G (IgG), a key protein in your immune system. It may help assess immune function or identify conditions affecting IgG metabolism.

Quick summary

["This test helps evaluate immune health or potential protein abnormalities in your blood."]

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

Key facts at a glance

LOINC
42986-0
Short code
N men sg A IgG Ser-mCnc
Synonyms
N men sg A IgG Ser-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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like chronic infections, immune system disorders (such as immunodeficiency), or unexplained protein changes in your blood. It could also be part of monitoring for conditions like multiple myeloma, where abnormal IgG fragments may appear.

What to Expect Before the Test

No special preparation is usually needed. You’ll provide a blood sample, typically drawn from a vein in your arm. If you’re on blood thinners, let your provider know to avoid unnecessary delays.

What the Results Mean

Results may indicate whether certain IgG fragments are present above or below expected levels, which could signal immune dysfunction, protein disorders, or other health concerns. Your provider will interpret results in the context of your overall health and symptoms.

Common Conditions Monitored

This test may be used to monitor conditions like chronic infections, immune deficiencies, or certain cancers (e.g., multiple myeloma) where IgG fragments can be abnormal. It’s not a standalone diagnostic test but supports broader evaluations.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG-related serum protein mass

Frequently asked questions

How long does it take to get results from this test?
Results are typically available within 1 to 3 business days, depending on lab processing times. Your provider will contact you once they’re ready for discussion.
What does a high or low result mean?
High levels may suggest conditions like multiple myeloma or certain infections, while low levels could indicate immune system issues or metabolic disorders. Your provider will explain what your specific result means for you.
Can diet or medications affect this test?
Dietary changes or medications (like blood thinners) may rarely influence blood protein levels, but they’re less likely to impact IgG fragments directly. Always inform your provider of all medications or supplements you’re taking.
  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