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Pneumonia Immunoglobulin Titers (Serum) - Quantitative

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

This test measures the levels of specific antibodies (immunoglobulins) in your blood that help your immune system fight pneumonia-causing infections.

Quick summary

["Helps assess your immune response to pneumonia-related pathogens over time."]

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

Key facts at a glance

LOINC
42991-0
Short code
M pneumo IgM Titr CSF
Synonyms
M pneumo IgM Titr CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you’ve had pneumonia, are at higher risk for respiratory infections, or if you’re recovering from an immune-related condition. It can also help monitor your body’s response to vaccines or treatments targeting pneumonia pathogens.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a simple blood draw from a vein in your arm. The test uses serum, which is the liquid part of your blood after clotting occurs.

What the Results Mean

Results show the concentration of specific antibodies (IgG, IgM, or others) against pneumonia-causing bacteria or viruses. Higher levels may indicate an active immune response, while lower levels could suggest a weaker response or past infection.

Common Uses and Interpretation

This test is often used to track immune function in patients with chronic lung diseases, immunocompromised states, or those receiving long-term treatments that may affect antibody production.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Elevated titers may indicate recent infection or vaccination effectiveness, while persistently low levels could signal immune deficiency or inadequate immune response. Results guide decisions about further treatment, vaccine boosters, or monitoring.

Short name

Ig Titers for Pneumonia

Frequently asked questions

What does a ‘positive’ or ‘negative’ result mean?
A ‘positive’ result typically means your body has detected and produced antibodies against the tested pathogen, but the exact interpretation depends on the baseline and clinical context (e.g., vaccination history, infection timeline).
How long does it take to get results?
Results are usually available within 1–3 business days, depending on lab processing times. Your doctor will discuss them with you during your follow-up visit.
Can I influence my antibody levels?
While you can’t directly control antibody production, maintaining a healthy immune system through diet, hydration, and avoiding smoking can support overall immune function, which may indirectly affect antibody responses.
  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