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Lung-specific IgG antibody to pneumococcal polysaccharides (serum)

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

This test measures the level of antibodies in your blood that target pneumococcal bacteria, which can cause serious infections like pneumonia.

Quick summary

["Helps assess immune response to pneumococcal vaccines or infections."]

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

Key facts at a glance

LOINC
17067-0
Short code
L pneumo4 IgM Ser-aCnc
Synonyms
L pneumo4 IgM Ser-aCnc
Category
chemistry
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 have a history of pneumococcal infections, are at high risk for pneumonia, or if you’ve received a pneumococcal vaccine. It can also help evaluate immune function after vaccination or monitor chronic conditions that affect immunity.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The process is quick and usually painless. If you’re on blood thinners or have a history of bleeding issues, let your provider know beforehand.

What the Test Results Mean

Higher-than-expected levels may indicate an active immune response to pneumococcal exposure or vaccination. Lower-than-expected levels could suggest a weakened immune system or inadequate vaccine response. Your provider will interpret results in the context of your medical history and symptoms.

Common Reasons for Testing

This test is often used in patients with chronic illnesses (e.g., HIV, cancer) or those who’ve had repeated pneumococcal infections. It may also be part of a broader immune evaluation after vaccination.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Antibodies to Pneumococcal (Serum)

Frequently asked questions

What Does This Test Detect?
This test detects IgG antibodies specific to pneumococcal polysaccharides, which are proteins found on the surface of pneumococcal bacteria. These antibodies are part of your immune system’s defense against pneumococcal infections.
How Might Results Affect My Treatment?
If your results show a strong antibody response, it may confirm your body is effectively protecting itself against pneumococcal bacteria. If results are low, your provider might recommend additional vaccines, immune-boosting therapies, or closer monitoring for infections.
Can I Get This Test at Home?
No, this test requires a blood sample drawn in a clinical setting. Some labs may offer at-home blood collection services, but results are typically processed in a lab and reported by your 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