SPUTUM EXAMINATION AFB (NHC)

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The Sputum Examination AFB (NHC) test is a microbiological examination used to detect Acid-Fast Bacilli (AFB), primarily Mycobacterium tuberculosis, in a sputum sample. A positive AFB smear is one of the earliest laboratory indicators of tuberculosis (TB) and other mycobacterial infections. The smear result and grading provide an estimate of the bacterial load, helping clinicians assess the severity of infection, initiate timely anti-tuberculosis therapy, and monitor the patient’s response to treatment over time.

For accurate results, an early morning sputum sample is preferred. The patient should rinse the mouth with plain water, take deep breaths, and cough deeply from the chest to produce a thick, purulent sputum sample (2–3 mL) rather than saliva. The specimen should be collected in a sterile, wide-mouth, leak-proof container and transported to the laboratory as soon as possible. If there is a delay of more than one hour, the sample should be refrigerated at 2–8°C. Proper specimen collection is essential to ensure reliable results and accurate diagnosis of tuberculosis.

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Sputum Examination AFB Test-

What is the SPUTUM EXAMINATION AFB (NHC) test?

The SPUTUM EXAMINATION AFB test is a laboratory test that examines a sputum sample for Acid-Fast Bacilli (AFB), primarily Mycobacterium tuberculosis, to help diagnose tuberculosis (TB).

Why is this test performed?

The test is performed to detect tuberculosis, assess the bacterial load, support early diagnosis, and monitor the effectiveness of anti-TB treatment.

How should the sputum sample be collected?

An early morning sputum sample is preferred. Rinse your mouth with plain water, take deep breaths, cough deeply from the chest, and collect 2–3 mL of thick sputum (not saliva) in a sterile, wide-mouth container.

What does a positive AFB smear indicate?

A positive AFB smear suggests the presence of mycobacterial infection, including tuberculosis. Additional clinical evaluation and laboratory tests may be required to confirm the diagnosis and determine appropriate treatment.

Is any special preparation required before the test?

No fasting is required. Follow the laboratory’s instructions for proper sputum collection to ensure an adequate sample and accurate test results.

Why is the SPUTUM EXAMINATION AFB test important?

The test enables early detection of tuberculosis, helps assess disease severity, guides treatment decisions, monitors response to therapy, and supports infection control by facilitating timely diagnosis.

Sputum Examination AFB

Positive AFB smear results provide a first indication of Mycobacterial infection and potential TB disease. Smear-positivity and grade indicates relative bacterial burden and correlates with disease presentation. Patient therapy may be initiated for TB based on smear result and clinical presentation. Changes in smear status are important for monitoring response to therapy.

Purpose of the Test:

Detect Acid-Fast Bacilli (AFB) in sputum samples.
Support the diagnosis of pulmonary tuberculosis (TB).
Assess the bacterial load through AFB smear grading.
Help doctors initiate timely anti-tuberculosis treatment.
Monitor the effectiveness of TB treatment over time.

Symptoms:

Importance:

Provides an early indication of tuberculosis infection.
Helps estimate the severity of infection based on bacterial load.
Supports prompt diagnosis and treatment decisions.
Assists in monitoring response to anti-TB therapy.
Contributes to reducing the spread of tuberculosis through early detection.

Instructions:

Common Sampling Guidelines: Early morning sputum is the preferred sputum specimen. Sterile, wide mouth container should be used for specimen collection. â€¢ The patient is instructed to rinse his/her mouth with plain water before bringing up the sputum. Instruct the patient to inhale deeply 2-3 times, cough up deeply from the chest and spit in the sputum container by bringing it closer to mouth. Make sure the sputum specimen is of good quality and not saliva. A good sputum specimen is thick, purulent and sufficient in amount (2-3 ml). Transport immediately at ambient temperature. Refrigerate(2-8Â°C)if a delay of more than one hour is anticipated Assure patient cooperation to get an adequate specimen. Metropolis will determine the number of squamous epithelial cells present for specimen adequacy.

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