Serum or plasma mass concentration of immunoglobulin G (IgG) antibodies against pneumococcal polysaccharides (qualitative screening)
This test measures whether your body has produced antibodies against certain types of pneumococcal bacteria, which can cause serious infections like pneumonia, bloodstream infections, or meningitis.
["A positive result may help identify if your immune system is responding to pneumococcal exposure, but it’s not a direct measure of current infection risk."]
Key facts at a glance
- LOINC
- 86147-6
- Short code
- S pneum Da 8 IgG Ser-mCnc
- Synonyms
- S pneum Da 8 IgG Ser-mCnc
- Category
- coagulation
- 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 This Test Measures
This test detects the presence of IgG antibodies specific to pneumococcal polysaccharides, which are sugar molecules found on the surface of some pneumococcal bacteria. These antibodies are part of your immune response to past exposure or vaccination. The test is qualitative, meaning it only tells you if antibodies are present rather than how much is present.
How the Test Works
Blood is drawn and processed to separate serum or plasma. The sample is then analyzed using an immunoassay method (likely clia or fia) to identify IgG antibodies against pneumococcal antigens. This helps determine if your immune system has recognized these bacteria before.
Why It Might Be Ordered
A healthcare provider may order this test if you have a history of pneumococcal infections, are at high risk (e.g., due to weakened immune systems, chronic conditions, or age), or if you’re being evaluated for immune response after vaccination.
What the Results Mean
A positive result indicates the presence of IgG antibodies against pneumococcal polysaccharides, suggesting your immune system has encountered these bacteria before. However, this does not confirm current infection or immunity. A negative result means no detectable antibodies were found.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
IgG Antibody to Pneumococcal (Screen)
Frequently asked questions
What does a positive result mean?
Can this test detect current pneumococcal infection?
Is this test the same as a pneumococcal vaccine antibody 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