Serum Pneumococcal Serotype-Specific Immunoglobulin G Antibody Levels (Quantitative)
This test measures the levels of antibodies against different types of *Pneumococcus* bacteria in your blood. These antibodies help your immune system recognize and fight infections caused by these bacteria.
["Your immune response to pneumococcal bacteria is assessed to understand protection against pneumonia or other infections."]
Key facts at a glance
- LOINC
- 42363-2
- Short code
- S pneum 7 serotypes IgG Pnl A Ser-mCnc
- Synonyms
- S pneum 7 serotypes IgG Pnl A 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 Might Be Ordered
Your healthcare provider may recommend this test if you have a history of pneumococcal infections, live in a setting with high exposure (like a nursing home), or are at higher risk for complications from respiratory infections. It may also be used to evaluate immune function after vaccination or in certain chronic illnesses.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The process is quick and typically painless. If you’re on blood thinners or have a history of bleeding issues, let your provider know beforehand.
What the Test Results Mean
Results show the concentration of antibodies against specific pneumococcal serotypes. Higher levels may indicate a strong immune response, while lower levels could suggest reduced protection. This information helps guide vaccination decisions or monitor immune function.
Common Reasons for Testing
This test is often used to assess immunity after receiving the pneumococcal vaccine (e.g., PCV13 or PPSV23) or to evaluate immune responses in individuals with weakened immune systems.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Pneumococcal IgG Antibody Levels
Frequently asked questions
How Does This Test Help Healthcare Providers?
What If My Results Are Low?
How Often Should I Get 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