Mycobacterium TB mRNA Test: Booking, Price, and Results
About Mycobacterium TB mRNA Test
| Field | Value |
|---|---|
| Also Known As | MTB mRNA Test, TB mRNA Test, MTB Viability PCR (vPCR), TB RT-qPCR test, 85B mRNA test |
| Sample Type | Sputum (deep lung secretion) |
| Fasting Required | No fasting required; early morning sample preferred |
| Report Time | 24 to 48 hours |
| Recommended For | All ages, both genders; particularly for those with suspected active TB |
| Price | Starting at ₹5,400 |
What Is a Mycobacterium TB mRNA Test?
The Mycobacterium TB mRNA test detects messenger RNA (mRNA) from living Mycobacterium tuberculosis bacteria in a sputum sample. Because mRNA is present only in viable, actively dividing cells, this test confirms whether TB bacteria are alive and active. Also known as the TB mRNA Test or MTB Viability PCR (vPCR) test, it helps doctors to suspect active pulmonary tuberculosis or to monitor how well treatment is working.
What Does a Mycobacterium TB mRNA Test Measure?
The test uses a technique called reverse transcription quantitative polymerase chain reaction (RT-qPCR) to detect a specific mRNA target in the sputum. Here is what it analyses:
| Component | What It Tells Us |
|---|---|
| 85B mRNA (Antigen 85B messenger RNA) | Detects mRNA produced by actively growing TB bacteria, confirming the bacteria are alive |
| M. tuberculosis viability | Distinguishes between live (viable) and dead (non-viable) TB bacilli, which standard DNA-based PCR tests cannot do |
Why Is a Mycobacterium TB mRNA Test Done?
This test is ordered when there is a clinical reason to confirm active TB infection or to track the progress of ongoing TB treatment.
Common Symptoms That May Require This Test
A doctor may recommend the Mycobacterium TB mRNA test if you have one or more of the following symptoms:
- A persistent cough lasting three weeks or longer
- Coughing up sputum or blood (haemoptysis)
- Chest pain or discomfort
- Loss of appetite and unexplained weight loss
- Night sweats
- Fever
- Persistent fatigue
Conditions This Test Can Help Detect
The Mycobacterium TB mRNA test can assist in identifying or monitoring several conditions:
- Active pulmonary tuberculosis
- Drug-resistant TB, where viable bacteria persist despite treatment
- Ongoing TB transmissibility in patients undergoing therapy
Mycobacterium TB mRNA Test for Chronic Disease Monitoring
The Mycobacterium TB mRNA test is a recognised marker for monitoring TB treatment response. Research shows that 85B mRNA levels in sputum decline as treatment takes effect, making the test a reliable early indicator of whether therapy is working. It is particularly valuable for patients on multi-drug-resistant TB (MDR-TB) regimens, where confirming bacterial clearance quickly matters. The test can also signal drug resistance when mRNA remains detectable despite treatment.
How to Prepare and What to Expect
Preparing for this test is straightforward, but the quality of the sputum sample directly affects the accuracy of the results.
Do You Need to Fast?
No fasting is required before giving a sputum sample. You may be advised to avoid eating for one to two hours before collection to prevent food contamination of the sample. At least one sample should ideally be collected first thing in the morning, when sputum is most concentrated.
Practical Tips Before Your Test
Keep the following in mind before your sample is collected:
- Drink extra water the evening before to help loosen sputum.
- Rinse your mouth with plain water before coughing up the sample.
- Inform your doctor about any medications you are currently taking, especially antibiotics.
- Understand that the test requires deep lung secretions, not saliva; your sample collector will guide you.
- Avoid collecting samples immediately after a meal.
Step-by-Step Procedure
Here is what typically happens during sputum collection:
- Rinse your mouth thoroughly with plain water before the collection begins.
- Take several slow, deep breaths to help loosen mucus from deep within your lungs.
- Cough forcefully and repeatedly until you produce thick mucus from your chest, then spit it into the sterile container provided.
- The sample is collected in a specially treated container that protects RNA from breaking down.
- The container is kept cold and transported to the laboratory within two hours to preserve the sample's integrity.
- In the laboratory, RNA is extracted and analysed using RT-qPCR to detect the 85B mRNA target.
Factors That Can Affect Accuracy
Several factors can influence the reliability of your Mycobacterium TB mRNA test result:
- Submitting saliva instead of deep sputum (the most common source of inaccurate results)
- Delay in transporting the sample to the laboratory (RNA degrades quickly at room temperature)
- Starting anti-TB medications before the sample is collected
- Recent use of antibiotics
- Poor cold-chain maintenance during sample transport
Understanding Your Mycobacterium TB mRNA Test Results
Results are reported as either "Detected" or "Not Detected." The table below summarises what each outcome generally means.
| Parameter | Result | Interpretation |
|---|---|---|
| MTB 85B mRNA | Not Detected (Negative) | No viable M. tuberculosis found in the sample |
| MTB 85B mRNA | Detected (Positive) | Viable M. tuberculosis present, indicating active infection |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain health conditions can affect how results are interpreted:
- Patients with HIV infection tend to have lower levels of TB bacteria in their sputum compared to those without HIV. This means that results may sometimes be negative even when TB is present, and clinical findings must be considered alongside the test result.
- Patients already on anti-TB treatment will show declining mRNA levels as therapy takes effect. A persistently positive result after several weeks of treatment may suggest drug resistance and warrants further investigation.
How to Maintain Healthy Levels
These are general wellness tips to support your immune health during or after TB treatment:
- Eat a balanced diet with adequate protein, vitamins, and minerals to support immune function and tissue repair.
- Keep living and sleeping areas well-ventilated with good airflow to reduce the concentration of airborne droplets.
- Prioritise regular sleep and manage stress to help your body recover effectively.
Lupin Diagnostics Mycobacterium TB mRNA Test Price and Home Collection
The Mycobacterium TB mRNA test is available at Lupin Diagnostics with home sample collection across cities. The table below shows indicative prices across major cities in India:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹5,400 |
| Pune | ₹5,400 |
| Hyderabad | ₹5,400 |
| Chennai | ₹5,400 |
| Bangalore | ₹5,400 |
| Kolkata | ₹5,400 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- You can opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home sputum sample collection across cities through trained sample collectors who follow proper cold-chain protocols to preserve RNA integrity. All samples are processed in NABL-accredited laboratories, and reports are delivered digitally via email or WhatsApp.
Frequently Asked Questions
A standard TB PCR test detects bacterial DNA, which can be present in both living and dead bacteria. The TB mRNA test specifically detects mRNA, which is present only in actively multiplying bacteria. This makes the Mycobacterium TB mRNA test a more reliable indicator of active, ongoing infection than of past exposure or dead organisms.
Yes, this is one of the key strengths of the test. Because mRNA degrades rapidly in dead or dormant cells, a positive result points to actively growing bacteria, which is characteristic of active TB. Latent TB, where bacteria are dormant and not multiplying, typically produces a negative result.
The test helps doctors track whether treatment is effective. Research shows that mRNA levels in sputum drop significantly after 15 to 30 days of effective therapy. If mRNA remains detectable after several weeks of treatment, it may indicate drug resistance, prompting a change in the treatment approach.
A positive result means viable TB bacteria were detected in your sample. Your doctor will review the result alongside your clinical symptoms, chest X-ray findings, and may request a drug sensitivity test to guide your prescription. Do not attempt to interpret the result on your own; always consult your doctor promptly.
Published research reports that the 85B mRNA test achieves a sensitivity of 98.3%, specificity of 95.0%, and an overall accuracy of 96.7%. These figures make it one of the more reliable molecular methods available for detecting active TB infection.
The test does not directly identify the genetic mutations responsible for drug resistance. However, if 85B mRNA remains detectable after several weeks of treatment, this suggests that the current regimen is not effectively killing bacteria. This finding usually prompts a doctor to arrange additional drug susceptibility testing.
Mycobacterium TB mRNA Test: Booking, Price, and Results
