Mantoux Test - Price, Normal Range, Purpose and Results

Most people picture tuberculosis (TB) as a persistent cough or visible illness. But not all TB announces itself. In latent TB, bacteria lie dormant inside your body without causing any symptoms at all. That's where the Mantoux test comes in. Understanding how it works, what the procedure involves, and what a Mantoux test normal range actually looks like can help you walk into your next health check-up fully informed.

What Is a Mantoux Test?

The Mantoux test, also called the tuberculin skin test (TST) or PPD injection test, checks whether your immune system recognises TB bacteria. A tiny amount of purified protein derivative (PPD) is injected just beneath the skin on your inner forearm. If you have been exposed to Mycobacterium tuberculosis before, your immune cells "remember" it and trigger a visible skin reaction at the injection site. This test does not confirm active disease. It simply reveals whether your body has encountered TB bacteria at some point.

What Is the Purpose of a Mantoux Test?

The Mantoux test's purpose goes well beyond confirming a cough. Doctors recommend it for several specific reasons:

• Latent tuberculosis screening: Detecting dormant TB before symptoms appear.
• Contact tracing: Checking family members or colleagues exposed to an active TB patient.
• Occupational screening: Routine checks for healthcare workers, lab staff, and hospital employees.
• Immigration requirements: Many countries require proof of TB screening before granting visas.

Symptoms That Prompt a TB Screen

Certain warning signs may lead a doctor to order a TB skin test:

• A persistent cough lasting more than 3 weeks
• Unexplained weight loss or ongoing fatigue
• Evening fevers and drenching night sweats
• Chest pain that does not go away

If you notice any of these symptoms, please consult a qualified healthcare professional for evaluation.

How Does the Mantoux Test Procedure Work?

The Mantoux test procedure is straightforward but requires two separate clinic visits. Here is what happens:

• Visit 1 (Day 0): A healthcare worker injects 0.1 ml of PPD solution into the inner surface of your forearm. A small, raised bump appears at the site. The injection takes just a few seconds.
• Visit 2 (48–72 hours later): A trained professional measures any firm swelling (called induration) at the site. This measurement, recorded in millimetres, determines your result.

Between visits, follow these simple care tips:

• Do not scratch or rub the injection site.
• Avoid covering the area with bandages or plasters.
• Bathing and washing your arm is perfectly fine.

Understanding the Mantoux Test Normal Range

The Mantoux test normal range threshold shifts depending on your risk level. A lower reading may be significant for someone with a weakened immune system, while a higher threshold applies to healthy individuals with minimal exposure risk. Here is a breakdown:

A reading below your category's threshold is generally considered negative. Your doctor interprets the result alongside your medical history.

How Should You Interpret Mantoux Test Results?

A positive Mantoux test result does not mean you have active, contagious TB. It indicates your immune system has encountered TB bacteria at some point. To determine whether the infection is latent or active, doctors typically order a chest X-ray or sputum test as follow-up investigations.

Your healthcare provider will guide the next steps based on your specific situation.

What Causes a False-Positive or False-Negative Result?

Results are not always straightforward. A few factors can skew them:

• False positives may occur due to prior BCG vaccination, infection with non-TB mycobacteria, or measurement errors.
• False negatives can happen if the immune system is severely weakened or if TB exposure occurred within the past 8–10 weeks.

Multiple BCG doses, common in many Indian vaccination schedules, can increase skin test sensitivity. Your doctor considers the BCG history when reading results.

What Is the Mantoux Test Price in India?

The Mantoux test price is remarkably affordable. At Lupin Diagnostics, it starts at just ₹150. At other major diagnostic chains, the cost generally ranges from ₹150 to ₹350. Since the test requires two visits, confirm whether follow-up reading charges apply when you book.

Catching Latent TB Early Matters

Without treatment, some people with latent TB may develop active disease over their lifetime. Catching a dormant infection early gives you the chance to act before it progresses. The Mantoux test normal range gives doctors a clear, measurable way to assess your TB exposure risk.

If you have been in close contact with a TB patient or simply want peace of mind, Lupin Diagnostics offers the Mantoux test at NABL-accredited labs and collection centres across India. Book your screening today and take a proactive step towards better health.

Frequently Asked Questions

What happens if I fail to get my Mantoux test read within 72 hours?

The test result can no longer be reliably interpreted. You will need to schedule a fresh skin test, as the 48- to 72-hour reading window is essential for accurate results.

Can I take a bath or wash my arm after a Mantoux test?

Yes, you can gently wash the area with water. Just avoid scratching, rubbing, or applying a bandage over the injection site, as this may affect the skin reaction.

Does a positive Mantoux test mean I can spread tuberculosis to others?

A positive result typically indicates latent TB infection, not active disease. People with latent TB cannot spread the bacteria to others. Your doctor will order further tests to confirm your status.

Can a previous BCG vaccine alter my Mantoux test results?

Yes, the BCG vaccine may cause a false-positive reaction, and there is no reliable method to distinguish it from a true TB infection response.

Is fasting required for the Mantoux test?

Fasting is not required at all. The test involves only an intradermal injection on your forearm, so you can eat and drink normally before and after the sample collection.

This article is for informational and educational purposes only. It does not substitute professional medical advice, diagnosis, or treatment. Please consult a qualified healthcare provider for any concerns about tuberculosis or your test results.