Pneumococcal Antibody Screening by Serological Titration (Serum)

Why This Test Is Done

Doctors may order this test if you have a history of pneumococcal infections, are at high risk (e.g., elderly, immunocompromised), or if you’re being evaluated for vaccination effectiveness. It can also help monitor immune function in certain conditions.

No special preparation is needed. A blood sample is drawn from a vein, usually in your arm. You may feel a slight pinch, but it’s quick and painless.

The sample is sent to a lab where antibodies against pneumococcal bacteria are measured through a titration process, which compares how much antibody is present at different dilutions.

A positive result indicates the presence of antibodies, suggesting your immune system has recognized and responded to pneumococcal bacteria. The exact meaning depends on clinical context (e.g., vaccination history, symptoms).

Low or absent levels may mean you lack immunity, increasing your risk of infection. High levels could indicate prior exposure or vaccination. Your doctor will interpret results in relation to your health status.

This test is often used to assess immunity before vaccination, evaluate immune function in chronic illnesses, or diagnose potential infections in high-risk patients.

It helps determine if you’re protected against pneumococcal diseases, which can cause serious lung infections, bloodstream infections, or meningitis.