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Serum or plasma mass concentration of pneumococcal polysaccharide antigen (via immunoassay)

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

This test measures the amount of pneumococcal polysaccharide antigen in your blood, which may help assess immune response to pneumococcal infection or vaccination.

Quick summary

["Helps evaluate immune response to pneumococcal vaccines or infection risk in certain conditions."]

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

Key facts at a glance

LOINC
86130-2
Short code
S pneum Da 5 IgG Ser-mCnc
Synonyms
S pneum Da 5 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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have a weakened immune system, are at high risk for pneumococcal infections, or if you’ve received a pneumococcal vaccine recently. It can also be used to monitor immune function in certain chronic conditions or after certain treatments.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your vein (venipuncture) to draw blood. It usually takes a few minutes. If you’re nervous, let your provider know so they can help make it more comfortable.

What to Expect During the Test

The blood sample will be sent to a lab for analysis using an immunoassay method, which detects specific proteins from pneumococcal bacteria. Results are typically available within 24–48 hours.

What the Results Mean

Higher-than-expected levels may indicate recent pneumococcal infection or an immune response to vaccination. Lower-than-expected levels could suggest immune dysfunction or reduced protection. Your provider will discuss results in the context of your health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Pneumococcal Antigen Level

Frequently asked questions

How long does it take to get results?
Results are usually available within 24 to 48 hours, depending on lab processing times.
What does a high or low result mean?
A high result may suggest recent infection or an immune response to vaccination, while a low result could indicate immune suppression or reduced protection. Your provider will interpret results with your medical history.
Is this test covered by insurance?
Coverage depends on your insurance plan and clinical indication. Check with your provider or insurance company to confirm if this test is covered under your specific circumstances.
  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