How accurate is TB PCR test?

How accurate is TB PCR test?

Using culture as the gold standard, the overall sensitivity of TB PCR was 78.3%, and for pulmonary and extrapulmonary specimens it was 82.3% and 72.0%, respectively. Conclusions: TB PCR is a rapid and reliable test in the diagnosis and management of tuberculosis.

Which test has highest sensitivity for TB?

If sputum smears and NAA tests are negative, and TB is still suspected, cultures are the most sensitive tests for TB. Culture is therefore very useful for diagnosing both smear-negative TB and drug-resistant TB.

What is TB sensitivity?

RESULTS Pulmonary tuberculosis: Pooled results of the most widely used tests showed sensitivity at 76% and 59% and specificity at 92% and 91% in smear-positive and smear-negative patients respectively.

Is there a PCR test for TB?

A PCR test based on insertion sequence IS1081 was developed to detect Mycobacterium tuberculosis complex organisms in the peripheral blood. The method was applied to blood samples from immunocompetent individuals with localized pulmonary tuberculosis.

What is TB-PCR positive?

The TB-PCR is one of the tests that helps diagnose and confirm an infection of Tuberculosis. Tuberculosis is a disease caused by the bacteria Mycobacterium tuberculosis that generally attacks the lungs however possibly can affect other parts of the body.

What is the gold standard for TB testing?

The gold standard for TB diagnosis is either isolation of Mycobacterium tuberculosis (MTB) by culture or detection of MTB-specific nucleic acids by molecular methods [6, 7].

What are the different sensitivity testing methods?

In-vitro antimicrobial susceptibility testing can be performed using a variety of formats, the most common being disk diffusion, agar dilution, broth macrodilution, broth microdilution, and a concentration gradient test.

How is TB-PCR done?

PCR for Mycobacterium tuberculosis is done by GeneXpert on request. Sputum – will be decontaminated before PCR testing. Pleural fluid – >5mLs undiluted or in EDTA tube. Blood or bone marrow – Collect into EDTA tube.