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Serum or plasma mass concentration of immunoglobulin G (IgG) antibodies against pneumococcal polysaccharides (serogroup-specific, 14-valent)

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

This test measures your immune response to common bacterial strains that cause pneumonia. It helps assess protection against pneumococcal infections.

Quick summary

["Checks if your body has produced antibodies against common pneumonia-causing bacteria."]

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

Key facts at a glance

LOINC
86169-0
Short code
S pneum Da 9N IgG Ser-mCnc
Synonyms
S pneum Da 9N 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

The test detects specific antibodies (IgG) your immune system creates in response to 14 different types of pneumococcal bacteria. These antibodies are part of your body’s defense against infections caused by these bacteria, which can lead to serious illnesses like pneumonia or bloodstream infections.

Why It’s Done

Doctors may order this test for people with weakened immune systems, those at high risk of pneumococcal infections (e.g., elderly, chronic illness), or after vaccination to monitor immune response.

What to Expect Before the Test

No special preparation is needed. A blood sample is drawn from a vein, usually in your arm. The test is typically done in a lab and results are ready within a few days.

What the Results Mean

Higher levels of these antibodies suggest your immune system has recognized and responded to the bacteria. Low or absent levels may indicate poor immunity or a need for vaccination.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibodies to Pneumococcal Polysaccharides (14-valent)

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may suggest it if you have a history of recurrent infections, a condition like diabetes or HIV, or if you’re planning to receive the pneumococcal vaccine.
What does a low result mean?
A low result could mean your body isn’t producing enough antibodies to protect against these bacteria, which may require further evaluation or vaccination.
How long does it take to get results?
Results are usually available within 3–5 business days, depending on lab processing times.
  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