TB PCR - Tissue Block*

Tuberculosis remains one of leading infectious diseases worldwide. While pulmonary TB is most common form approximately 15-20% of TB cases involve organs outside the lungs. Diagnosing extrapulmonary TB is difficult because symptoms are nonspecific, bacterial numbers may be low and obtaining suitable specimens can be challenging. The TB PCR Tissue Test overcomes many of these limitations by directly identifying DNA of Mycobacterium tuberculosis. This allows healthcare professionals to diagnose the disease more rapidly than traditional culture methods which may take 4-8 weeks to produce results.

The test is used together with:

• Histopathological examination
• Acid-fast bacilli (AFB) staining
• Mycobacterial culture
• Gene-based molecular testing
• Imaging studies (CT, MRI, Ultrasound)
• Clinical evaluation

Because PCR detects the bacterial DNA rather than the living bacteria, results must always be interpreted together with the patient's symptoms, biopsy findings and other laboratory investigations.

What is the TB PCR Tissue Test?

The TB PCR Tissue Test is a molecular laboratory investigation that detects genetic material (DNA) of Mycobacterium tuberculosis in tissue samples obtained through biopsy or surgical procedures. PCR stands for Polymerase Chain Reaction, a laboratory technique that amplifies tiny amounts of bacterial DNA, which allows even a very small number of tuberculosis bacteria to be detected. Because of its excellent sensitivity and specificity, the TB PCR Tissue Test has become an important diagnostic tool for confirming TB infection in tissue specimens.

The tissue sample may be collected from:

• Lymph nodes
• Bone tissue
• Joint tissue
• Intestinal tissue
• Liver tissue
• Skin lesions
• Brain tissue
• Kidney tissue
• Lung tissue
• Other affected organs

The test is especially valuable when tuberculosis is suspected but routine staining or culture results are negative or delayed.

What is the Procedure of TB PCR Tissue Test?

The Procedure of TB PCR Tissue Test as follows:

• Tissue is collected from the affected organ or lesion using a biopsy or surgical procedure.
• The tissue specimen is placed in a sterile collection container.
• The sample is transported to the laboratory under appropriate conditions.
• DNA is extracted from the tissue specimen.
• PCR amplification is performed using Mycobacterium tuberculosis-specific primers.
• The amplified DNA is analysed for the presence of MTB genetic material.
• Quality control procedures are completed.
• Results are verified by laboratory specialists.
• A final report is issued to the treating physician.

What is the Purpose of TB PCR Tissue Test?

The TB PCR Tissue Test is performed for several important clinical purposes, including:

• To detect Mycobacterium tuberculosis DNA in tissue.
• To diagnose extrapulmonary tuberculosis.
• To confirm tuberculosis when routine tests are inconclusive.
• To investigate persistent lymph node enlargement.
• To evaluate chronic bone infections.
• To diagnose spinal tuberculosis.
• To investigate intestinal tuberculosis.
• To assess suspected renal tuberculosis.
• To evaluate skin tuberculosis.
• To diagnose tuberculosis affecting the brain or meninges.
• To support early initiation of anti-tuberculosis treatment.
• To differentiate tuberculosis from other inflammatory diseases.
• To complement biopsy findings.
• To improve diagnostic accuracy.
• To assist clinicians in treatment planning.

What are the Benefits of TB PCR Tissue Test?

The Benefits of TB PCR Tissue Test are as follows:

• Highly sensitive molecular test.
• Highly specific for Mycobacterium tuberculosis.
• Detects tuberculosis DNA directly.
• Provides faster results than culture.
• Useful for diagnosing extrapulmonary TB.
• Can detect very small amounts of bacterial DNA.
• Supports early diagnosis and treatment.
• Reduces diagnostic delays.
• Complements histopathological examination.
• Helps improve patient management.

What are the Limitations of TB PCR Tissue Test?

The following are some important limitations of the TB PCR Tissue Test:

• A negative result does not completely exclude tuberculosis.
• Very small tissue samples may reduce sensitivity.
• PCR cannot always distinguish live bacteria from dead bacterial DNA.
• Contamination may occasionally affect results.
• Additional laboratory tests may still be required.
• Histopathology and culture remain important complementary investigations.
• Prior anti-tuberculosis treatment may influence results.
• Laboratory expertise is essential.
• False-negative results may occur if bacterial numbers are extremely low.
• Clinical correlation is always necessary.

Who Should Undergo the TB PCR Tissue Test?

Healthcare providers may recommend the TB PCR Tissue Test for individuals who:

• Have persistent swollen lymph nodes with suspected tuberculosis.
• Have chronic bone or joint infections without a confirmed cause.
• Show biopsy findings suggestive of tuberculosis.
• Have suspected spinal tuberculosis (Pott's disease).
• Have unexplained chronic inflammatory lesions.
• Have suspected intestinal tuberculosis.
• Have kidney or urinary tract lesions suggestive of TB.
• Have persistent skin ulcers or nodules suspected to be tuberculous.
• Have symptoms of extrapulmonary tuberculosis with negative routine tests.
• Have a history of tuberculosis with suspected recurrence.
• Are immunocompromised and suspected of having TB.
• Require confirmation before starting anti-tuberculosis treatment.

What is the Preparation before the TB PCR-Tissue?

Proper preparation helps ensure reliable results and a smooth biopsy procedure.

• Fasting is usually not required for the PCR test itself, although it may be required before certain biopsy procedures.
• Inform your healthcare provider about all medications you are taking.
• Mention if you are taking blood-thinning medications.
• Inform the physician about any bleeding disorders.
• Tell your healthcare provider if you are pregnant.
• Follow all instructions provided before the biopsy procedure.
• Inform the doctor about previous tuberculosis treatment.
• Carry previous laboratory reports and imaging studies if available.
• Arrange transportation if sedation will be used during the biopsy.
• Follow post-biopsy care instructions carefully.

Where to Book Online Tests for TB PCR Tissue in Delhi?

In Delhi there are many diagnostic centres to book the online tests for TB PCR Tissue but patients prefer City Imaging for the best results and at a very affordable price.

Which TB PCR Tissue centre near me in Delhi?

TB PCR Tissue near me in Delhi is City Imaging and Clinical Labs. This centre provides the best results and the rates of the tests are very affordable as compared to others.

How to book a TB PCR Tissue test online at City Imaging?

Patients can book the TB PCR Tissue test online at City Imaging by visiting the website and book the test appointment online. There are also customer care numbers on the website that the patient can dial and book the test. In Delhi there are many diagnostic centres to book the online tests for TB PCR Tissue but patients prefer City Imaging for the best results and at a very affordable price.

What is TB PCR Tissue price in Delhi?

TB PCR Tissue price in Delhi may range from INR 2000 to INR 2500. The price may vary depending on various factors like location of diagnostic centres. It is expensive because of the advanced equipment and the skilled professionals used for this test.

Why to Choose City Imaging for TB PCR Tissue test in Delhi?

In Delhi patients choose City Imaging for TB PCR Tissue test because this centre has the best machines that give the best results. The diagnostic centre has very good patient service with helpline numbers for round the clock availability.

Final Words

The TB PCR-Tissue Test is a highly advanced molecular diagnostic investigation that plays a crucial role in identifying Mycobacterium tuberculosis infection in tissue specimens. It is valuable for diagnosing extrapulmonary tuberculosis where conventional laboratory methods may be slow or inconclusive. By directly detecting the tuberculosis DNA the test provides rapid, accurate and highly specific results that help clinicians diagnose the disease earlier than traditional culture techniques. The TB PCR Tissue Test is reliable; it should always be interpreted together with the patient's clinical history, physical examination, imaging findings, histopathology, microbiological culture, and other laboratory investigations. When incorporated into a comprehensive diagnostic strategy the TB PCR Tissue Test significantly improves the diagnosis and management of extrapulmonary tuberculosis. Its speed, accuracy and ability to detect the bacterial DNA directly make it one of most valuable molecular tools available for modern tuberculosis diagnosis.

Frequently Asked Questions (FAQ)

What is TB PCR-Tissue Test?

It is a molecular test that detects DNA of Mycobacterium tuberculosis in tissue biopsy samples.

Why is TB PCR Tissue Test performed?

It is mainly used to diagnose extrapulmonary tuberculosis affecting organs other than the lungs.

What type of sample is required?

A tissue specimen obtained through biopsy or surgery.

Is fasting required before this test?

Fasting is not required for the PCR test itself but it may be necessary before certain biopsy procedures.

What are other names of TB PCR Tissue Test?

The other name of the TB PCR Tissue Test is, TB PCR-Tissue.