Mycoplasma Pneumoniae IgM Serum Test
Short Name: Mycoplasma IgM
Also known as: Mycoplasma IgM Antibody Test, M. pneumoniae IgM Test, Walking Pneumonia IgM Test, Atypical Pneumonia IgM Serology
Mycoplasma Pneumoniae IgM Serum Test test available at DNA Labs India for ₹3,500. Uses Enzyme Immunoassay (EIA), Chemiluminescent Immunoassay (CLIA) on Serum samples. Results in Sample accepted up to Sunday by 6:00 PM. Report available the next day.. Free home collection in 300+ cities across India.
🩺 Medically Reviewed By
Dr Kothari Ramesh Shantilal
Consultant Microbiologist · Reg: 27670
Last reviewed: September 7, 2026
Overview
The Mycoplasma Pneumoniae IgM Serum Test is performed to detect acute or recent Mycoplasma pneumoniae infection. It helps confirm a clinical suspicion of atypical pneumonia or other respiratory tract infections caused by this bacterium. The test is valuable for guiding appropriate antibiotic selection, differentiating Mycoplasma infection from viral or other bacterial pneumonias, and supporting public health surveillance during outbreaks in community settings.
- Test Code
- 1282
- CPT Code
- 86738
- ICD Code
- J15.7
- Price
- ₹3,500
- Sample Type
- Serum
- Result Time
- Sample accepted up to Sunday by 6:00 PM. Report available the next day.
- Fasting Required
- No
- Method
- Enzyme Immunoassay (EIA), Chemiluminescent Immunoassay (CLIA)
Sample Collection
No special preparation such as fasting is required. Inform the phlebotomist about any current medications, especially antibiotics or immunosuppressive drugs. Stay well hydrated before the blood draw.
Method: Venipuncture
Laboratory Analysis
A trained phlebotomist will clean the venipuncture site with an antiseptic, apply a tourniquet, and collect approximately 2 mL of blood into a Serum Separator Tube (SST). The procedure typically takes less than five minutes.
Report Delivery
Apply gentle pressure with cotton or a bandage over the puncture site for two to three minutes. Avoid heavy lifting with the affected arm for the rest of the day. Mild bruising at the site is normal and resolves within a few days.
Timeline: Sample accepted up to Sunday by 6:00 PM. Report available the next day.
Patient Instructions
About This Test
Who Should Get This Test
The Mycoplasma Pneumoniae IgM Serum Test is performed to detect acute or recent Mycoplasma pneumoniae infection. It helps confirm a clinical suspicion of atypical pneumonia or other respiratory tract infections caused by this bacterium. The test is valuable for guiding appropriate antibiotic selection, differentiating Mycoplasma infection from viral or other bacterial pneumonias, and supporting public health surveillance during outbreaks in community settings.
How to Prepare
- No fasting required prior to sample collection
- Sample type: 2 mL (1 mL minimum) serum from one SST tube
- Allow blood to clot in the SST for 30 minutes before centrifugation
- Ship refrigerated at 2 to 8 degrees Celsius or frozen at minus 20 degrees Celsius
- Avoid haemolysed or lipemic samples as they may interfere with assay performance
- Label the sample clearly with patient name, date of collection, and test name
Doctor's Notes
Reviewed by Dr Kothari Ramesh Shantilal — MBBS, MD (Microbiology) · Reg. No. 27670
"Mycoplasma pneumoniae is an atypical respiratory pathogen responsible for up to 20% of community-acquired pneumonia cases. It disproportionately affects children, young adults, and individuals in crowded settings such as schools, college dormitories, and military barracks. IgM antibodies typically appear within the first one to two weeks of symptom onset and their detection supports a diagnosis of acute infection. However, clinicians should always correlate serological findings with clinical presentation, chest imaging, and complete blood count findings. Empiric macrolide or doxycycline therapy is commonly initiated while awaiting serological confirmation, especially in patients with progressive atypical pneumonia symptoms that are unresponsive to standard beta-lactam antibiotics."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Haemolysed or severely lipemic serum samples
- Samples collected in incorrect tube type (not SST)
- Samples received without proper labelling or identification
- Samples that exceed the stability window at the received temperature condition
- Insufficient sample volume (less than 1 mL serum)
Understanding Your Results
Negative
No detectable IgM antibodies against Mycoplasma pneumoniae were found. This may indicate the absence of current acute infection. However, if symptoms are present and the test was performed within the first week of illness, a false-negative result is possible. Consider retesting after seven to ten days or requesting a Mycoplasma pneumoniae IgG test for comparison.
Positive
IgM antibodies against Mycoplasma pneumoniae were detected. This result is consistent with an acute or recent Mycoplasma pneumoniae infection. Clinical correlation is recommended. Your physician may initiate or adjust antibiotic therapy (typically macrolides such as azithromycin or doxycycline) based on this result and clinical assessment.
Equivocal / Borderline
The result falls in an indeterminate zone. This may occur during early seroconversion or due to non-specific antibody reactivity. A repeat test after seven to fourteen days is recommended. Clinical correlation and consideration of additional diagnostic methods such as PCR or chest imaging is advised.
Consult a physician or infectious disease specialist if you experience a persistent cough lasting more than two weeks, fever with respiratory symptoms, difficulty breathing, or if your Mycoplasma pneumoniae IgM test returns a positive or equivocal result. Seek immediate medical attention if you develop high-grade fever, chest pain, severe breathlessness, or symptoms suggestive of complications such as pleural effusion, encephalitis, or haemolytic anaemia. Individuals who are immunocompromised, elderly, or have underlying chronic lung disease should seek early medical evaluation.
Limitations
- ⚠IgM antibodies may persist for several weeks to months after acute infection, making it difficult to distinguish between current and recent past infection in some cases
- ⚠This test is not suitable for monitoring treatment response or determining cure
- ⚠Negative IgM does not fully exclude Mycoplasma pneumoniae infection, particularly if the sample is collected too early in the disease course
- ⚠PCR-based molecular detection may be more sensitive during the very early acute phase of infection before seroconversion
- ⚠A single positive IgM result should ideally be confirmed with paired sera or correlated with IgG testing and clinical presentation
Risks & Considerations
- ●Minor bruising or haematoma at the venipuncture site
- ●Slight pain or discomfort during needle insertion
- ●Rarely, dizziness or lightheadedness during or after blood collection
- ●Very rare risk of infection at the puncture site
Interfering Factors
- ●Recent antibiotic use (especially macrolides or tetracyclines) may suppress antibody production and lead to false-negative results
- ●Immunocompromised patients (HIV, transplant recipients, those on immunosuppressive therapy) may have a delayed or absent IgM response
- ●Cross-reactivity with other Mycoplasma species (e.g., M. genitalium, M. hominis) may occasionally produce false-positive results
- ●Very early infection tested within the first five to seven days of symptom onset may yield a false-negative result before seroconversion
- ●Rheumatoid factor (RF) in serum may cause non-specific reactivity and interfere with IgM assay interpretation
Compare With Similar Tests
| Test | Mycoplasma Pneumoniae IgM Serum Test | Mycoplasma Pneumoniae IgG Serum Test | Mycoplasma Pneumoniae PCR (Respiratory Swab) | Cold Agglutinin Test | Mycoplasma Pneumoniae Culture |
|---|---|---|---|---|---|
| Comparison | Mycoplasma Pneumoniae IgM Serum Test | The IgG test detects past or previous exposure to Mycoplasma pneumoniae. IgG antibodies develop later and persist longer. A fourfold rise in IgG between paired acute and convalescent sera confirms recent infection. The IgM test is more useful for detecting acute infection, while the IgG test is better for confirming past exposure or seroconversion. | PCR directly detects the DNA of Mycoplasma pneumoniae from a respiratory sample (throat swab or nasopharyngeal swab). It is more sensitive during the early acute phase before antibodies develop. The IgM serum test is more accessible and does not require a respiratory sample. Both tests complement each other for accurate diagnosis. | Cold agglutinins are non-specific antibodies that may be elevated during Mycoplasma pneumoniae infection. This test is less specific and less sensitive than the IgM antibody test. It was historically used as a screening tool but has largely been replaced by serological and molecular methods for definitive diagnosis. | Culture is the gold standard for confirming Mycoplasma pneumoniae infection, but it is time-consuming (up to several weeks), technically demanding, and not routinely available in most clinical laboratories. The IgM serological test provides faster results and is more practical for clinical decision-making. |
Frequently Asked Questions
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