Mycoplasma pneumoniae Antibody, IgG and IgM, Serum, Arbitrary Concentration

What This Test Measures

Mycoplasma pneumoniae is a bacterium that often causes a mild but lingering respiratory illness, sometimes called "walking pneumonia." Your immune system produces antibodies against it: IgM antibodies tend to appear early in an infection, while IgG antibodies typically develop later and may persist. This test measures the amount of these antibodies in your serum.

Why Your Doctor Ordered It

Your clinician may order this test when you have persistent cough, fever, or other respiratory symptoms that could fit a Mycoplasma infection, especially when standard tests are inconclusive. It can also help clarify whether a recent illness was caused by this organism.

How the Sample Is Collected

A healthcare professional draws a small amount of blood from a vein in your arm into a tube, which is then processed to separate the serum. The serum is analyzed in the laboratory for antibody levels. The collection usually takes only a few minutes and carries minimal risk, such as brief discomfort or minor bruising at the needle site.

Understanding Your Results

Results are reported as arbitrary concentration units for IgG and IgM, and are best interpreted together with your symptoms and the timing of your illness. A single result can be hard to interpret on its own, so your doctor may compare a second sample taken weeks apart to look for a rise or fall in antibody levels. Always discuss what your specific values mean with your clinician.