Serum IgG Anti-Streptococcus Group C (Streptococcus agalactiae) Antibody Concentration
This test measures the level of antibodies in your blood that target *Streptococcus group C* bacteria, which can cause infections like pneumonia, sepsis, or urinary tract infections. It helps assess immunity after vaccination or exposure.
["This test checks for immunity to group C strep bacteria, often used after vaccination or in high-risk patients."]
Key facts at a glance
- LOINC
- 51806-8
- Short code
- C pneum IgG Ser IA-aCnc
- Synonyms
- C pneum IgG 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
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you’ve had recent exposure to group C strep bacteria, received a vaccine for it, or are at higher risk of infections (e.g., newborns, immunocompromised individuals). It can also be part of monitoring after treatment for infections caused by these bacteria.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, typically drawn from your arm. The test is usually done in a lab and results are ready within a few days.
What the Results Mean
Results indicate whether your immune system has produced detectable antibodies against group C strep. Low or absent levels may suggest insufficient immunity, while higher levels confirm protection. Your provider will interpret results in the context of your medical history and symptoms.
Common Reasons for Testing
This test is most relevant for patients who’ve received the *Streptococcus group C vaccine* (e.g., for newborns) or those with recurrent infections linked to group C strep. It’s less commonly used for routine screening.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated antibody levels confirm immunity post-vaccination or natural exposure. Low levels may prompt further investigation into infection risk or vaccination status. This test supports early detection in high-risk populations and guides preventive measures.
Short name
IgG Anti-Strep C Antibody
Frequently asked questions
What does a positive result mean?
How long does it take to get results?
Can I eat or drink before 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