Pneumococcal IgG Antibody by Serotype (Mass Concentration) – Serum
This test measures the levels of antibodies in your blood that help your immune system fight pneumococcal bacteria, which can cause serious infections like pneumonia, meningitis, or bloodstream infections.
["Assesses your immune response to pneumococcal bacteria, useful for evaluating risk or monitoring treatment in certain conditions."]
Key facts at a glance
- LOINC
- 5256-3
- Short code
- M pneumo IgM Ser IA-aCnc
- Synonyms
- M pneumo IgM Ser IA-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- 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
The test detects specific antibodies (IgG) produced in response to exposure to pneumococcal bacteria. These antibodies are part of your body’s defense system against infections caused by these bacteria. The result helps determine if your immune system has recognized and responded to the bacteria.
Why It Might Be Ordered
Your healthcare provider may order this test if you have a history of pneumococcal infections, are at high risk (e.g., due to weakened immune system, chronic illness, or age), or if you’re being considered for pneumococcal vaccination. It can also help monitor immune response after vaccination.
Sample Collection and Preparation
A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate serum (the liquid part without clotting factors), which is then tested for antibody levels. This process is quick and typically done in a lab.
What to Expect Before the Test
No special preparation is needed, but inform your provider if you’re on blood-thinning medications or have bleeding disorders. Avoid alcohol for 24 hours before the test if possible, as it may affect blood clotting.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High antibody levels may indicate past infection or vaccination success, while low levels could suggest poor immune response, increased infection risk, or underlying immune issues. This test is particularly valuable in guiding vaccination decisions or assessing immune function in high-risk patients.
Short name
IgG Antibody to Pneumococcal Bacteria
Frequently asked questions
What does a positive result mean?
Can this test be used to diagnose pneumonia?
How long does it take to get results?
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