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Mycoplasma pneumoniae Antibody, IgG (Serum) – Quantitative

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of IgG antibodies against *Mycoplasma pneumoniae*, a bacteria that can cause respiratory infections like pneumonia or bronchitis.

Quick summary

["Helps diagnose or monitor infections caused by *Mycoplasma pneumoniae* in your throat or lungs."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
685-8
Short code
Resp Mycoplasma Throat Cult
Synonyms
Resp Mycoplasma Throat Cult
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

Mycoplasma pneumoniae is a common cause of atypical pneumonia, especially in adults and children. Antibodies develop after infection, so this test can help confirm a diagnosis when other tests (like throat cultures) are unclear or negative. It’s often used alongside other tests to guide treatment decisions.

How the Test Works

Blood is drawn from a vein, and the serum is tested for IgG antibodies using an immunoassay method. This detects the immune system’s response to the bacteria, which may take days to weeks to appear after infection.

What to Expect Before the Test

No special preparation is needed. You may have a small bruise or sore spot where the needle was inserted, but this usually fades quickly. If you’re on blood-thinning medication, let your provider know before the test.

What the Results Mean

Results are qualitative (positive/negative) or quantitative (measured concentration). A positive result suggests past or current infection, but it doesn’t always indicate active symptoms. Follow-up testing or clinical correlation may be needed for diagnosis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Mycoplasma pneumoniae IgG Antibody

Frequently asked questions

How can I prepare for this test?
No special preparation is needed, but inform your healthcare provider if you’re on blood-thinning medications or have a history of bleeding disorders.
What does a positive result mean?
A positive result indicates the presence of IgG antibodies against *Mycoplasma pneumoniae*, which may mean you’ve been infected at some point. However, this doesn’t always mean you’re currently sick. Your doctor will consider symptoms, other test results, and medical history to diagnose active infection.
Can this test be done at home?
No, this test requires a blood sample drawn in a clinical setting by a healthcare professional. Results are typically available within 1–3 business days.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy