Nasal Swab AFB Smear/ZN Stain

Specimen Required

Nasal Swab

Fasting Required

Purpose of the Test

The test is used to diagnose tuberculosis, a bacterial infection caused by Mycobacterium tuberculosis. Tuberculosis can cause a range of symptoms, including cough, fever, night sweats, and weight loss. The nasal swab AFB smear/ZN stain test can help to confirm a diagnosis of tuberculosis and determine the appropriate course of treatment.

When this test is required

A healthcare provider may order a nasal swab AFB smear/ZN stain test if a person has symptoms of tuberculosis, such as cough, fever, night sweats, and weight loss, or if they have been exposed to someone with tuberculosis. The test may also be ordered if a person has a positive tuberculin skin test or a chest X-ray that suggests tuberculosis.

What the Test Detects

The nasal swab AFB smear/ZN stain test is used to detect the presence of acid-fast bacilli (AFB) in a sample of nasal secretions or mucus. AFB are a type of bacteria that have a unique cell wall structure, which makes them resistant to many common staining methods.

Preparation for the Test

There is no special preparation required for the test. The healthcare provider will use a sterile swab to collect the sample, and the procedure should not cause any significant discomfort. It is important to follow any instructions given by the healthcare provider to ensure accurate test results.

Sample Requirements

The test requires a sample of nasal secretions or mucus. The healthcare provider will use a sterile swab to collect a sample from the inside of the nose. The sample will then be sent to a laboratory for analysis.

Additional Notes

The nasal swab AFB smear/ZN stain test is not 100% accurate and may produce false-negative results in some cases. If a person has symptoms of tuberculosis but the test is negative, the healthcare provider may order additional tests, such as a sputum culture or a nucleic acid amplification test (NAAT), to confirm or rule out a diagnosis of tuberculosis. It is important to follow any instructions given by the healthcare provider to ensure accurate test results. If a diagnosis of tuberculosis is confirmed, the healthcare provider will develop an appropriate treatment plan, which may involve a combination of antibiotics for several months. It is important to follow the treatment plan as prescribed to prevent the spread of infection and promote healing.

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