An AFB-DNA (TB-PCR) Detection by Real-Time PCR with Reflex to Rifampicin Resistance by Ultra CBNAAT on Tissue is an advanced molecular test specifically designed to diagnose Histopathological or Extrapulmonary Tuberculosis (EPTB) within solid organ systems and structural tissues.

When tuberculosis manifests outside the lungs, it frequently forms deep-seated lesions or granulomas. Because the concentration of live bacteria in these dense tissues is often incredibly low (paucibacillary), traditional microscope smears and standard biopsy stains can easily miss them. This panel extracts the genetic blueprint (DNA) directly from tissue cells to deliver an incredibly rapid, ultra-sensitive diagnostic answer.

What Types of Tissue Specimens Are Evaluated?
This panel is performed on solid tissue biopsy specimens collected via needle aspiration, core biopsy, or surgical excision, including:

Lymph Nodes: Most commonly from cervical (neck), axillary, or mediastinal lymph nodes to diagnose TB Lymphadenitis.

Bone and Joint Tissue: Collected from suspected skeletal structures to identify bone TB or Pott’s Disease (spinal tuberculosis).

Gastrointestinal / Peritoneal Tissue: Biopsies taken from the bowel wall lining or omentum during an endoscopy or laparoscopy.

Pleural / Pericardial Tissue: Small structural samples taken from the protective sacs around the lungs or heart.

Skin / Soft Tissue: From non-healing chronic ulcers, nodules, or deep abscesses.

An AFB-DNA (TB-PCR) Detection by Real-Time PCR with Reflex to Rifampicin Resistance by Ultra CBNAAT on Body Fluids is a specialized, rapid molecular diagnostic profile. It is specifically designed to diagnose Extrapulmonary Tuberculosis (EPTB)—tuberculosis that has developed outside of the lungs in various fluid-filled compartments of the body.

Because tuberculosis bacteria are notoriously difficult to find under a microscope in liquid body samples (paucibacillary samples), this DNA-amplification test provides an essential, highly sensitive diagnostic solution.

What Types of Body Fluids Are Tested?
This panel can be performed on several types of clinically harvested fluids, depending on where the infection is suspected:

Cerebrospinal Fluid (CSF): Taken via a lumbar puncture to diagnose life-threatening TB Meningitis (infection of the membranes surrounding the brain and spinal cord).

Pleural Fluid: Drawn from the space surrounding the lungs to diagnose TB Pleurisy.

Ascitic / Peritoneal Fluid: Collected from the abdominal cavity to diagnose Peritoneal TB (gastrointestinal tuberculosis).

Synovial Fluid: Extracted from a swollen joint space to evaluate TB Arthritis or musculoskeletal tuberculosis.

Pericardial Fluid: Harvested from the sac surrounding the heart to diagnose TB Pericarditis.

An **AFB (Acid-Fast Bacilli) Detection by Smear Examination using ZN (Ziehl-Neelsen) Stain for Body Fluids** is a rapid, fundamental diagnostic test used to detect the presence of mycobacteria (such as *Mycobacterium tuberculosis*) in various non-blood bodily fluids.

It is one of the oldest, fastest, and most cost-effective methods available to immediately screen for tuberculosis outside of the lungs (extrapulmonary TB).

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### How the Test Works

* **The Fluids Tested:** This test can be performed on various sterile body fluids, including **Pleural fluid** (around the lungs), **Cerebrospinal fluid (CSF)** (around the brain/spinal cord), **Ascitic/Peritoneal fluid** (abdominal cavity), **Synovial fluid** (joints), or **Pericardial fluid** (around the heart).
* **Concentration:** Because body fluids often contain a very low concentration of bacteria compared to sputum, the laboratory first spins the fluid in a high-speed centrifuge to concentrate any bacterial cells into a pellet at the bottom.
* **The ZN Staining Process:**
1. A smear of the concentrated fluid is fixed onto a glass slide and stained with a bright red dye called **Carbol Fuchsin**.
2. The slide is gently heated, which allows the dye to penetrate the thick, waxy, lipid-rich cell walls (mycolic acid) characteristic of mycobacteria.
3. The slide is washed with an acid-alcohol solution. Standard bacteria lose their color (decolorize), but mycobacteria resist the acid wash and retain the bright red dye—hence the name **"Acid-Fast"**.
4. A blue counterstain (Methylene Blue) is applied to color the background cells and non-acid-fast debris.

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Adenosine Deaminase (ADA) activity in pericardial fluid is a highly valuable, rapid, and cost-effective biomarker used for the diagnosis of Tuberculous Pericarditis (TBP).
Key Concepts and Mechanism
Primary Role: The main utility of measuring pericardial fluid ADA is to rapidly differentiate TBP (Tuberculosis of the heart sac) from other causes of pericardial effusion (fluid around the heart), such as malignancy or non-tuberculous infections.
Source: ADA is mainly produced by T-lymphocytes and macrophages as part of the cell-mediated immune response.
TBP Pathogenesis: In TBP, the Mycobacterium tuberculosis bacteria stimulate a vigorous local immune reaction, leading to a high concentration of ADA-releasing T-lymphocytes migrating into the pericardial space.
Diagnostic Interpretation
Tuberculous Pericarditis (TBP): ADA levels are typically markedly elevated in TBP.
Cut-off Value: A commonly accepted and highly reliable cut-off value for suggesting TBP is \ge 40 \text{ U/L} (or IU/L).
Note: Some studies suggest a cut-off of \ge 50 \text{ U/L} for even higher specificity.
Performance: At the \ge 40 \text{ U/L} threshold, pericardial fluid ADA generally demonstrates high sensitivity (87-93%) and high specificity (83-97%) for diagnosing TBP.
Differential Diagnosis:
High ADA : Strongly suggests TBP.
Low ADA : Essentially rules out TBP in a patient with a low pre-test probability, but high levels can rarely be seen in purulent (bacterial) pericarditis or certain malignancies.