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Pneumococcal Antibody Detection by Serological Titration (Serum)

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

This test measures your immune response to pneumococcal bacteria, which can cause serious infections like pneumonia, meningitis, or bloodstream infections. It helps determine if your body has produced antibodies against these bacteria.

Quick summary

["Assesses your immunity to pneumococcal bacteria via antibody levels in your blood."]

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

Key facts at a glance

LOINC
24311-3
Short code
M pneumo Ab sp2 Titr Ser
Synonyms
M pneumo Ab sp2 Titr Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 complications (e.g., due to weakened immune system, chronic health conditions, or age), or if you’re planning travel to areas with higher infection risks. It can also be used to monitor immunity after vaccination.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein, typically in a clinic or lab. The sample will be drawn into a tube containing an anticoagulant to prevent clotting. The process usually takes a few minutes.

What the Test Results Mean

Results indicate the highest dilution of your serum that still reacts with pneumococcal antigens. Higher titers suggest stronger immunity, while lower titers may indicate insufficient protection. Exact thresholds for clinical significance depend on context (e.g., vaccination history).

How This Test Relates to Your Health

Elevated antibody levels may confirm immunity post-vaccination or natural infection. Low levels could signal a need for booster vaccination or further evaluation of immune function. This test is not a substitute for other diagnostic tools (e.g., cultures) but supports broader infection prevention strategies.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Role in Diagnosis and Prevention

Short name

Pneumococcal Antibody Level (Serum)

Frequently asked questions

What does a ‘positive’ or ‘negative’ result mean for me?
A ‘positive’ result (detectable antibodies) generally means your body has mounted an immune response to pneumococcal bacteria. This could follow vaccination, prior infection, or both. A ‘negative’ result suggests either no prior exposure or insufficient immunity, prompting further discussion with your provider about vaccination or other preventive measures.
How often should I get this test?
The frequency depends on your health status and vaccination history. Typically, this test isn’t routinely recommended for healthy individuals without risk factors. Your provider will determine if periodic testing is needed based on your specific circumstances (e.g., immunocompromised status, travel plans).
Can I get this test at home?
No, this test requires a laboratory sample collected by a healthcare professional. Blood draws are performed in clinical settings to ensure accuracy and safety. Some providers may offer at-home blood collection services, but the analysis still occurs in a lab.
  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