Mycoplasma Pneumoniae Igg Antibodies

Mycoplasma pneumoniae IgG Antibodies

What it is

The Mycoplasma pneumoniae IgG Antibodies test measures IgG class antibodies in the blood that develop in response to infection with Mycoplasma pneumoniae, a common cause of atypical or “walking” pneumonia. IgG antibodies usually appear several weeks after infection and remain in the body long-term, indicating past exposure or infection.

Uses

This test is used to confirm prior exposure to Mycoplasma pneumoniae and may help in the diagnosis of recent or ongoing infection when combined with IgM testing and clinical evaluation. It is also useful in epidemiological studies to track past infection rates within populations.

Symptoms That May Lead to the Test

Doctors may recommend this test if you present with signs of atypical pneumonia such as prolonged cough, sore throat, fever, chest discomfort, headache, fatigue, or shortness of breath. It may also be considered if you have a suspected respiratory infection that is not explained by common bacterial or viral causes.

Abnormal Results

Positive IgG: Indicates prior infection or exposure to Mycoplasma pneumoniae. A positive IgG result alone usually reflects past infection and not necessarily an active case, unless IgM is also elevated or symptoms are ongoing.

Negative IgG: Suggests no prior exposure or infection. In very recent infections, IgG may still be absent, so repeat testing or IgM analysis may be needed.

Risks

The test requires a simple blood draw. Risks are minimal and limited to temporary pain, bruising, or lightheadedness at the puncture site. These side effects usually resolve quickly.