Serological Testing for Pneumococcal Serotypes (IgG Antibody Levels)
This test measures your immune response to different types of *Streptococcus pneumoniae* (pneumococcal) bacteria by checking the levels of IgG antibodies against specific serotypes. It helps assess protection against pneumonia, meningitis, or other infections caused by these bacteria.
["This test helps determine if your immune system has developed protection against common pneumococcal strains."]
Key facts at a glance
- LOINC
- 42364-0
- Short code
- S pneum 6 serotypes IgG Pnl Ser-mCnc
- Synonyms
- S pneum 6 serotypes IgG Pnl 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
Why This Test Is Done
Doctors may order this test if you have a history of pneumococcal infections, live in a high-risk setting (like a nursing home), have weakened immunity (e.g., from chemotherapy or HIV), or are planning travel to areas with higher infection risks. It may also be used to monitor immune response after vaccination.
What to Expect Before the Test
No special preparation is needed. A blood sample will be drawn from a vein in your arm, similar to other blood tests. The process usually takes a few minutes, and you may feel a slight pinch or discomfort.
What the Results Mean
Results show the concentration of IgG antibodies against each pneumococcal serotype. Higher levels indicate stronger immunity to those specific strains. Interpretation depends on clinical context, such as vaccination history or symptoms.
Common Causes of Abnormal Results
Low antibody levels may suggest insufficient immunity, especially if you’ve received pneumococcal vaccines. High levels could indicate recent infection or immune response. Always discuss results with your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test helps evaluate immune protection against pneumococcal infections, guiding decisions about vaccination, preventive measures, or further medical evaluation. It’s particularly useful for high-risk individuals or those with compromised immune systems.
Short name
Pneumococcal Serotype Antibody Levels
Frequently asked questions
Why did my doctor order this test?
What do my test results mean?
Can I get this test at home?
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