Skip to content

IgG Antibody to Streptococcus pneumoniae (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.

Quick summary

["Helps assess immunity to pneumococcal infections and guide vaccination decisions."]

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

Key facts at a glance

LOINC
10908-2
Short code
Deprecated S pneum7 IgG Ser IA-aCnc
Synonyms
Deprecated S pneum7 IgG Ser IA-aCnc
Category
coagulation
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 Is Done

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 considering pneumococcal vaccination. It can also help 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 blood is collected in a tube and sent to the lab for analysis.

What the Test Results Mean

Results are qualitative (present/absent) or quantitative, showing the concentration of antibodies. Higher levels may indicate prior infection or vaccination, while lower levels suggest potential vulnerability to pneumococcal disease.

Common Reasons for Abnormal Results

Elevated levels may reflect past infection or vaccination, but they don’t guarantee immunity. Low levels could mean reduced protection, especially in high-risk individuals. Always discuss results with your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Anti-Streptococcus pneumoniae IgG

Frequently asked questions

What does a high level of IgG antibodies to *Streptococcus pneumoniae* indicate?
A high level suggests your immune system has recognized and produced antibodies against this bacterium, likely due to prior infection or vaccination. This can help confirm immunity or guide vaccination decisions, especially in high-risk groups.
What does a low level of IgG antibodies to *Streptococcus pneumoniae* indicate?
A low level may mean your body hasn’t produced enough antibodies to protect against pneumococcal infections. This could be due to a weakened immune system, lack of vaccination, or recent infection. Your provider may recommend vaccination or further testing.
Is this test covered by insurance?
Most insurance plans cover this test if ordered by a healthcare provider for medical necessity (e.g., evaluating risk, monitoring immunity). Check with your insurer for specifics, as coverage may vary. Your provider can help clarify coverage details.
  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