TB Diagnosis: 3 Early Detection Test For Rapid Solution

TB Diagnosis: 3 Early Detection Test For Rapid Solution

TB (Tuberculosis) is a contagious bacterial infection caused by Mycobacterium tuberculosis. Common symptoms include cough, weight loss, and fatigue. TB Diagnosis involves testing Sputum Tests, TST, and chest X-rays. With early detection and proper treatment, TB can be cured.


3 Best Test For TB Diagnosis

There are several tests used for TB Diagnosis, including:

  1. Tuberculin Skin Test (TST)
  2. Sputum Tests
  3. Chest X-rays


TB Diagnosis Test - Drlogy


1. Tuberculin Skin Test (TST)

  • The Tuberculin Skin Test (TST), also known as the Mantoux test, is a common diagnostic test for tuberculosis (TB) infection.
  • It is used to determine whether a person has been exposed to the bacteria that cause TB.
  • It involves injecting a small amount of purified protein derivative (PPD) tuberculin under the skin and checking for a positive reaction 48 to 72 hours later.
  • A positive result does not necessarily indicate active TB disease but rather that a person has been infected with TB bacteria at some point.
  • Despite its limitations, the TST is widely available and relatively inexpensive, making it a commonly used diagnostic test for TB infection.
Test Name Tuberculin Skin Test (TST)
Also Known As Mantoux Test
Purpose Detecting latent TB infection
Sample Intradermal injection of tuberculin antigen
Preparation None
Procedure Injection and measurement of skin reaction
Test Timing Read after 48-72 hours
Test Price (INR) 200-500
Result Value Induration size in millimeters
Normal Value < 5 mm (non-reactive)
Accuracy Moderate
Interpretation Positive result indicates exposure to TB

Detect tuberculosis exposure with the Tuberculin Skin Test (TST), also known as the Mantoux test. A positive result suggests exposure to TB bacteria.


2. Sputum Tests

  • Sputum tests involve examining a sample of phlegm under a microscope to look for TB bacteria.
  • This test is commonly used to diagnose TB in the lungs.
  • They involve analyzing the mucus coughed up from the lungs for the presence of TB bacteria, and can provide a definitive diagnosis for active TB infections.
  • Sputum tests can guide appropriate treatment decisions and distinguish between active and latent TB infections.
Test Name Sputum Tests for TB
Also Known As Sputum AFB Test
Purpose Detecting Mycobacterium tuberculosis in sputum samples
Sample Sputum (Mucus coughed up from the lungs)
Preparation None
Procedure Collection of sputum sample and microscopic examination for Acid-Fast Bacilli (AFB)
Test Timing Anytime
Test Price (INR) 200-500
Result Value Presence or absence of AFB in sputum
Normal Value Absence of AFB
Accuracy Moderate to high
Interpretation Positive result indicates TB infection

Detect TB with Sputum Tests (Sputum AFB Test) - collects and examines sputum for Mycobacterium tuberculosis presence.


3. Chest X-rays

  • Chest X-rays are commonly used to detect TB in the lungs.
  • An X-ray can show whether there are any abnormalities in the lungs that may be due to TB infection.
  • They can reveal changes in the lungs caused by TB, such as nodules, cavities, or fluid.
  • While they cannot diagnose TB on their own, they can provide valuable information to help confirm the presence of TB bacteria.
  • However, chest X-rays have their limitations. They may miss early or mild cases of TB infection, and they cannot distinguish between TB and other lung diseases.
Test Name Chest X-rays for TB
Also Known As Chest radiography
Purpose Detecting abnormalities in the lungs indicative of TB
Sample N/A (Non-invasive)
Preparation None
Procedure Imaging of the chest using X-ray technology
Test Timing Usually done as part of TB screening or diagnosis
Test Price (INR) Varies
Result Value Visual assessment of lung abnormalities
Normal Value Absence of visible abnormalities in the lungs
Accuracy Moderate
Interpretation Presence of lung infiltrates or cavities may indicate TB

Detect lung abnormalities using Chest X-rays for TB, an imaging procedure. Visual assessment reveals lung infiltrates or cavities associated with TB.


TB Diagnosis Tests Overview

Test Name Tuberculin Skin Test (TST) Sputum Tests Chest X-rays for TB
Also Known As Mantoux Test Sputum Culture, AFB Smear Chest radiography
Purpose Screening for exposure to TB Detecting TB bacteria in sputum Detecting lung abnormalities indicative of TB
Sample Skin Sputum N/A (Non-invasive)
Preparation None Collecting sputum sample None
Procedure Injection of tuberculin protein into the skin, followed by measurement of reaction Examination of sputum under a microscope, culture for bacterial growth Imaging of the chest using X-ray technology
Test Timing Usually read 48-72 hours after administration Time varies depending on the test Usually done as part of TB screening or diagnosis
Test Price (INR) Range 100-500 500-1500 Varies
Result Value Measurement of skin induration (raised area) Presence of TB bacteria, AFB (Acid-fast Bacilli) identified Visual assessment of lung abnormalities
Normal Value No significant induration (varies based on risk factors) Absence of TB bacteria, negative AFB smear Absence of visible abnormalities in the lungs
Accuracy Moderate High Moderate
Interpretation Positive reaction indicates exposure to TB or latent TB infection Positive result indicates TB infection Presence of lung infiltrates or cavities may indicate TB

Screen for TB exposure with the Tuberculin Skin Test (TST), detect TB bacteria with Sputum Tests, and identify lung abnormalities with Chest X-rays for TB.


TB Differential Diagnosis

Diseases Similar Diseases Differentiating Factors
Pneumonia Lung Cancer Chest X-ray findings, presence of lung masses
Bronchitis Asthma Presence of chronic cough and wheezing, lung function tests
Chronic Obstructive Pulmonary Disease (COPD) Heart Failure Lung function tests, chest X-ray, presence of fluid in the lungs

When diagnosing tuberculosis (TB), it is important to consider other potential diseases that may present with similar symptoms.


Best Doctor for TB Diagnosis

Specialist Description
Pulmonologist Expert in diagnosing and treating lung diseases, including TB
Infectious Disease Specialist Specializes in infectious diseases, including TB diagnosis and treatment
Chest Physician Focuses on respiratory conditions, including TB

Among the specialists, a pulmonologist is the best choice for TB diagnosis. They possess expertise in diagnosing and treating various lung diseases, including tuberculosis.


7 Interesting Facts About TB

Here are 7 Interesting Facts about TB.

  1. Tuberculosis (TB) is caused by Mycobacterium tuberculosis, a bacteria that primarily affects the lungs.
  2. TB is one of the top 10 causes of death worldwide, even though it is preventable and curable.
  3. Not everyone infected with TB bacteria becomes sick immediately. Some people have latent TB infection, where the bacteria remain dormant in the body.
  4. TB can affect other parts of the body besides the lungs, such as the kidneys, spine, and brain.
  5. TB is transmitted through the air when an infected person coughs, sneezes, or talks, making it highly contagious.
  6. TB can be drug-resistant, meaning it does not respond to standard TB medications. Multidrug-resistant TB (MDR-TB) and extensively drug-resistant TB (XDR-TB) are more difficult to treat.
  7. The BCG vaccine provides some protection against severe forms of TB, particularly in children, but it is not fully effective in preventing all forms of the disease



Tuberculosis (TB) is a serious infectious disease that can affect various parts of the body, but most commonly affects the lungs. Accurate and timely diagnosis of TB is essential for effective treatment and control of the disease.Overall, prompt and accurate diagnosis of TB is critical for successful treatment and control of the disease.



  • TB Testing & Diagnosis | TB | CDC [1].
  • Tuberculosis (TB) -NHS [2].
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TB Diagnosis FAQ

How is TB diagnosed in the lungs?

TB in the lungs is diagnosed through a combination of medical history, physical examination, and diagnostic tests. A healthcare provider may ask about symptoms, such as coughing, fever, night sweats, and weight loss, and perform a physical examination of the lungs and chest.

How is the diagnosis of TB best confirmed?

The diagnosis of TB is best confirmed through a combination of tests, which may include a medical history and physical exam, chest X-ray, sputum tests, and sometimes a biopsy or CT scan.

What are 5 causes of TB?

Tuberculosis (TB) is caused by a bacterium called Mycobacterium tuberculosis. Here are some of the factors that can contribute to the spread and development of TB: 1. Contact with TB patients, 2. Immune system weakness and TB 3. Crowded living conditions and TB 4. Malnutrition, healthcare access and TB 5. TB awareness and delayed diagnosis

Is TB very serious?

Yes, TB (tuberculosis) can be a very serious disease if left untreated or if treatment is not completed properly. TB is caused by a bacterial infection that primarily affects the lungs but can also affect other parts of the body.

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