Pneumococcal Antibody Screening (Serum) by Mass Concentration

What This Test Measures

The test detects specific antibodies (immunoglobulins) produced by your immune system in response to pneumococcal bacteria. These antibodies are part of your body’s defense mechanism and can indicate exposure to the bacteria, though they don’t always correlate directly with active infection.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have a history of recurrent infections, weakened immune system, or if you’re at higher risk for pneumococcal complications (e.g., due to age, chronic health conditions, or recent vaccination). It can also be part of a broader evaluation for immune function.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The blood is processed to separate serum (the liquid part without clotting factors), which is then tested for antibody levels. This test does not require fasting.

What to Expect Before the Test

No special preparation is needed. You may experience mild discomfort from the needle, but most people tolerate the procedure well. If you’re on blood-thinning medication or have a history of bleeding disorders, let your provider know before the test.