Mycoplasma pneumoniae-specific IgG antibody (serum/plasma)

Why This Test Is Done

Your doctor may order this test if you’ve had symptoms like cough, fever, or fatigue—especially if they suspect a respiratory infection caused by *Mycoplasma pneumoniae*. It’s also used to evaluate chronic conditions (like chronic bronchitis) where past exposure might play a role.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm. The test uses serum or plasma, so you may experience a slight pinch or discomfort during the draw. Results are typically available within 1–3 business days.

What the Results Mean

Positive results indicate the presence of IgG antibodies, suggesting you’ve likely been exposed to *Mycoplasma pneumoniae* at some point. Negative results mean no detectable antibodies were found. Elevated levels may support a diagnosis of past infection, but they don’t confirm an active illness.

Common Causes of Positive Results

A positive result is most common after recovering from a *Mycoplasma pneumoniae* infection, but it can linger for months or years. It may also appear in people with chronic respiratory conditions (like COPD) or those with autoimmune disorders.