AFB CULTURE

AFB CULTURE is a diagnostic laboratory test that detects and grows acid-fast bacilli (AFB) from respiratory or other clinical specimens to confirm active mycobacterial infection, most commonly Mycobacterium tuberculosis complex. The test measures viable mycobacteria by incubating samples on selective solid and/or automated liquid media, allowing definitive identification and downstream susceptibility testing. Culture remains the gold standard for tuberculosis diagnosis because of its higher sensitivity compared with smear microscopy and its ability to support targeted treatment decisions.

This home-collected AFB culture service is suited for individuals with suspected pulmonary TB—such as persistent cough, haemoptysis, unexplained weight loss, fever or abnormal chest radiographs—as well as close contacts of confirmed cases and immunocompromised patients. Trained collection personnel obtain and handle specimens at home to reduce exposure risk, ensure sample quality, and deliver secure, accredited laboratory processing with timely reporting across Dubai and the UAE. Positive culture results enable species identification and phenotypic drug susceptibility testing, which are essential for appropriate therapy and public health notification.

Sample collection typically requires early-morning deep sputum and may include multiple specimens (commonly 2–3) to improve detection; samples are transported under strict biosafety conditions to the laboratory the same day. Culture turnaround varies by method—automated liquid systems (e.g., MGIT) often provide results in 1–3 weeks while solid media may require several weeks—so molecular or smear tests are sometimes used concurrently for rapid guidance. Be aware that prior or ongoing anti‑TB therapy and inadequate samples can reduce culture yield, and negative culture does not fully exclude TB without clinical correlation.

• Culture positivity for Acid-Fast Bacilli (AFB)
• Mycobacterium tuberculosis complex identification
• Non-tuberculous mycobacteria (NTM) identification
• Phenotypic drug susceptibility testing (first-line drugs)

• Persistent cough lasting more than 2–3 weeks
• Haemoptysis (blood in sputum)
• Unexplained fever, night sweats, or weight loss
• Close contact with a confirmed pulmonary TB case
• Abnormal chest X-ray suggestive of tuberculosis
• Immunocompromised individuals (e.g., HIV, transplant patients)

• Definitive confirmation of active tuberculosis infection
• Greater sensitivity than smear microscopy for detecting TB
• Enables species identification and drug-resistance testing for targeted therapy
• Convenient home collection by trained staff, reducing clinic exposure
• Accredited laboratory processing with secure and timely reporting across Dubai and the UAE

• Home-collected early-morning deep sputum sample (1–3 samples recommended)
• Avoid eating or smoking for about 1 hour before collection; rinse mouth prior to producing sputum
• Inform the collection team and your physician of any current or recent anti-TB treatment or antibiotics
• Ensure availability for same-day handover to the technician for prompt transport to the laboratory