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Serum or plasma mass concentration of immunoglobulin G (IgG) antibodies against pneumococcal polysaccharides (serotype-specific or total)

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

This test measures your immune response to pneumococcal bacteria, which can cause serious infections like pneumonia, bloodstream infections, or meningitis.

Quick summary

["Assesses your body’s ability to fight pneumococcal infections through IgG antibodies."]

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

Key facts at a glance

LOINC
86039-5
Short code
S pneum Da 2 IgG Ser-mCnc
Synonyms
S pneum Da 2 IgG 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

What This Test Measures

IgG antibodies are a type of protein produced by your immune system to help fight infections. This test checks the amount of these antibodies in your blood, specifically targeting pneumococcal bacteria. The results help doctors evaluate your immunity status or response to vaccination.

Why It’s Ordered

Your healthcare provider may order this test if you have a history of pneumococcal infections, are at high risk (e.g., elderly, immunocompromised, or with chronic illnesses), or if you’ve received a pneumococcal vaccine to monitor your immune response.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein, typically in your arm. The process takes a few minutes, and you may feel slight discomfort.

What the Results Mean

Results are qualitative (yes/no) or semi-quantitative, indicating whether sufficient IgG antibodies are present to protect against pneumococcal infection. Higher levels suggest a strong immune response, while lower levels may indicate insufficient protection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Pneumococcal Antibody Level (IgG)

Frequently asked questions

How does this test help doctors?
This test helps determine if you have adequate immunity against pneumococcal bacteria. It’s particularly useful for patients who have had pneumococcal infections, those who are immunocompromised, or those who have received pneumococcal vaccines to confirm protection.
What if my results are low?
If your IgG antibody levels are low, your doctor may recommend additional vaccinations, boosters, or further evaluation of your immune system. They can also discuss preventive measures to reduce infection risk.
Can this test be affected by other medications?
Generally, this test is not affected by common medications. However, if you’re on long-term immunosuppressive therapy or have recent infections, your results may be influenced, so discuss this with your healthcare provider.
  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