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IgG Antibody to Streptococcus pneumoniae (Mass Concentration)

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

This test measures the level of antibodies in your blood that target *Streptococcus pneumoniae*, a common bacteria that can cause serious infections like pneumonia.

Quick summary

["Helps assess immune response to pneumococcal vaccination or infection risk."]

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

Key facts at a glance

LOINC
30503-7
Short code
Deprecated S pneum8 IgG sp1 Ser-mCnc
Synonyms
Deprecated S pneum8 IgG sp1 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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you’ve had a pneumococcal vaccination, have a weakened immune system, or are at higher risk for pneumococcal infections. It can also be used to monitor immune function or diagnose suspected infections in certain cases.

What to Expect Before the Test

No special preparation is needed. You’ll typically have a small needle inserted into your arm to draw blood. If you’re concerned about needles, let your provider know so they can discuss alternatives.

What the Results Mean

Higher-than-normal levels may indicate an active immune response (e.g., after vaccination or infection). Lower-than-normal levels might suggest immune deficiency or reduced protection against pneumococcal bacteria.

Common Reasons for Testing

This test is often used in pediatric care to evaluate vaccine response, in immunocompromised patients to monitor infection risk, or in research settings to study immune responses to pneumococcal exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Anti-pneumococcal IgG

Frequently asked questions

Is there pain or swelling at the blood draw site?
Most people experience only mild discomfort or bruising at the injection site. If you feel pain, swelling, or redness lasting more than a few days, contact your provider.
How long will I need to wait for results?
Results are usually available within 1–3 business days, depending on lab processing. Your provider will discuss them with you during your follow-up visit.
Can I drink or eat before this test?
No special diet or fasting is required for this blood test. However, if you have other tests scheduled, follow your provider’s instructions for consistency.
  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