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Antibody to Streptococcus pneumoniae (IgG) – Serum

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of antibodies in your blood that target *Streptococcus pneumoniae*, a common bacterial cause of pneumonia, meningitis, and other infections. These antibodies help your immune system fight off the bacteria if you become infected.

Quick summary

["This test helps assess your immune response to pneumococcal bacteria and may guide vaccination decisions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
86165-8
Short code
S pneum Da 9N Ab Ser Ql
Synonyms
S pneum Da 9N Ab Ser Ql
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Your healthcare provider may order this test if you have a history of pneumococcal infections, are at higher risk (e.g., due to weakened immunity, chronic conditions, or age), or if you’re considering pneumococcal vaccination. It can also be used to monitor immune response after vaccination.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The process takes a few minutes, and you may feel a slight pinch or discomfort.

What the Results Mean

Results show the concentration of pneumococcal antibodies in your blood. Higher levels may indicate past infection or vaccination, while lower levels suggest a weaker immune response. Your provider will interpret results in the context of your medical history and symptoms.

Common Reasons for Testing

This test is often used to evaluate immune function, confirm vaccination effectiveness, or diagnose conditions linked to pneumococcal exposure (e.g., recurrent infections). It’s not typically used for diagnosing active infections like pneumonia.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Pneumococcal

Frequently asked questions

What does a positive result mean?
Does this test replace a physical exam or other tests?
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional in a clinical setting. Home blood tests for antibodies are not standard for this specific analyte.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your provider will contact you with the final report once it’s ready.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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