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Mycoplasma pneumoniae Antibody, Serum (Qualitative or Quantitative Immunoassay)

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

This test detects antibodies to *Mycoplasma pneumoniae*, a common bacterial cause of respiratory infections like pneumonia and bronchitis. It helps diagnose infections when symptoms persist or when other tests are inconclusive.

Quick summary

["This test may help identify if you’ve been exposed to *Mycoplasma pneumoniae* and could support a diagnosis of respiratory illness."]

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

Key facts at a glance

LOINC
110733-3
Short code
Mycoplasma Ab Msmt Ser
Synonyms
Mycoplasma Ab Msmt Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is Done

Doctors may order this test if you have symptoms like cough, fever, or chest pain that suggest a bacterial lung infection. It’s particularly useful when other tests (like a chest X-ray or culture) are unclear or when symptoms last longer than usual for a viral infection.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein, usually in a clinic or lab. The test looks for antibodies (proteins your immune system makes) to *Mycoplasma pneumoniae* in your serum.

How the Test Works

The test uses an immunoassay (like ELISA) to detect specific antibodies (IgG or IgM) against *Mycoplasma pneumoniae*. IgM antibodies appear early in infection and fade over weeks, while IgG antibodies develop later and persist longer.

What the Results Mean

A positive result means your immune system has likely encountered *Mycoplasma pneumoniae*, but it doesn’t always confirm a recent infection. Results can vary based on when the test was taken relative to symptoms. False positives or negatives may occur, so doctors may use other tests for confirmation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Mycoplasma pneumoniae Ab (IgG/IgM)

Frequently asked questions

What does a positive result mean?
A positive result suggests exposure to *Mycoplasma pneumoniae*, but it may not indicate an active infection at the time of testing. If you have respiratory symptoms, your doctor may recommend further testing (like a chest X-ray or culture) to confirm the diagnosis. Antibodies can stay in your system for months or years after recovery.
Can this test be used to diagnose pneumonia?
This test can help support a diagnosis of *Mycoplasma pneumoniae* pneumonia, especially if other tests (like a blood culture or viral tests) are negative. However, doctors often rely on a combination of symptoms, test results, and clinical judgment. Imaging studies (like a chest X-ray) may also be used to assess lung involvement.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. If your doctor suspects a serious infection, they may ask for results sooner. Follow-up testing or additional evaluation might be needed if results are unclear or symptoms persist.
  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