Mycoplasma pneumoniae Antibody, IgG (Serum)

Why This Test Matters

Mycoplasma pneumoniae is a tiny bacteria that can cause symptoms similar to colds or flu, but it often requires specific testing to confirm. This test checks for IgG antibodies, which develop after your body has been exposed to the bacteria. Unlike IgM antibodies (which appear sooner but fade faster), IgG antibodies remain in your system for longer and indicate past or ongoing infection.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from your arm. The sample is sent to a lab where it’s tested for the presence of IgG antibodies against *Mycoplasma pneumoniae*. Results are usually available within a few days.

What the Results Mean

A positive result suggests you’ve been exposed to *Mycoplasma pneumoniae* and your immune system has responded. However, it doesn’t always mean you’re currently sick—some people may have lingering antibodies even after symptoms have cleared. A negative result means no detectable IgG antibodies were found at the time of testing.

Common Causes of False Results

False positives or negatives can occur due to recent exposure, cross-reactions with other bacteria, or testing timing. If your symptoms persist or worsen, your doctor may recommend retesting or additional diagnostic tests.