Anti-Spneumococcal IgG Antibody (Serum)
This test measures your immune system’s response to pneumococcal bacteria, which can cause serious infections like pneumonia, bloodstream infections, or meningitis. It helps assess whether your body has produced antibodies against these bacteria.
["Checks if your immune system has developed protection against pneumococcal bacteria."]
Key facts at a glance
- LOINC
- 47334-8
- Short code
- Deprecated S pneum20 IgG 2:1 Ser-Rto
- Synonyms
- Deprecated S pneum20 IgG 2:1 Ser-Rto
- 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, are at higher risk (e.g., due to age, weakened immune system, or chronic health conditions), or if you’re planning a trip to regions with higher infection rates. It can also be used to monitor immune function in certain conditions.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The process usually takes a few minutes, and you may feel slight discomfort, but it’s generally not painful. If you’re on blood-thinning medication, let your provider know before the test.
What the Test Results Mean
Higher levels of IgG antibodies suggest your immune system has recognized and responded to pneumococcal bacteria. Lower or absent levels may indicate a weaker immune response or previous exposure that no longer triggers antibody production. Results are interpreted by your healthcare provider based on your medical history and symptoms.
Common Reasons for Testing
This test is often used to evaluate immune function, screen for past infections, or guide decisions about vaccines (like the pneumococcal vaccine). It can also help diagnose or monitor conditions that affect immunity, such as HIV or certain autoimmune diseases.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated IgG levels may indicate past exposure to pneumococcal bacteria, which can provide some protection. However, they don’t always correlate directly with current immunity. If your levels are low, your provider may recommend vaccination, immune support strategies, or further evaluation of your immune status. Always discuss results with your healthcare provider to understand their implications for your health.
Short name
IgG Antibody to Pneumococcus
Frequently asked questions
Will this test show if I have an active infection right now?
How long will it take to get my results back?
Can I get this test at home, or do I need to go to a lab?
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