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Test Code MAFC Culture and Sensitivity, Acid Fast Bacilli (AFB)

Additional Codes

Epic Ordering Code LAB877
NBS code LBC03762
Service code 23053

 

Specimen Requirements

Submit only one of the following

Preferred:    
White sterile container   Dark Green Top Eswab

Specimen Type: Respiratory specimens such as sputum, ETT, tracheal, gastric aspirates (laryngeal swabs, throat swabs, nasal swabs, nasopharyngeal swabs from paediatric patient)
Container/Tube: Sterile screw-capped container, eSwab, M40 transystem Amies agar transport media (for non-NUH patients)
Volume: 5.0 mL, Entire swab
Minimum Volume: 2.0 mL, 1 swab
Collection Instructions: First morning, deep cough specimen is preferred.

 

Please refer to eSwab Training Slides.

 

Specimen Type: Tissues, biopsies and wound swabs
Container/Tube: Sterile screw-capped container, eSwab, M40 transystem Amies agar transport media (Copan)(for non-NUH patients)
Volume: Tissues / biopsies - as much as possible

               Wound swabs - 1 swab

Collection Instructions: Wounds - Collect specimen with sterile swab with transport medium.

 

Please refer to eSwab Training Slides.

 

Specimen Type: Urine
Container/Tube:  2 or more sterile containers without boric acid
Minimum Volume: At least 40.0 mL
Collection Instructions: Submit first pass early morning urine in 2 or more sterile containers. Mid-stream, catheterized and 24-hour pooled urine are not advisable.

AFB smear is not performed for urine specimens.

 

Specimen Type: Gastric Washings, CSF, Peritoneal fluid, Pleural fluid, Synovial fluid, other fluids.
Container/Tube: Sterile screw-capped container
Volume: 3.0 mL for CSF; 5.0 mL for other fluids
Minimum Volume: 2.0 mL
Collection Instructions: Gastric lavage should be collected before breakfast.

 

Specimen Type: Blood / Bone marrow
Container/Tube: Green Top (Lithium Heparin)
Volume: 4.5 mL
Collection Instructions: AFB smears is not performed for blood specimens.

 

Specimen Type: Bronchial Washings

Container/Tube: Sterile screw-capped container
Volume: 5.0 mL
Minimum Volume: 2.0 mL

Specimen Stability and Condition

Specimen Type All types
Transport Condition Submit sample to lab immediately (ambient)
Refrigerate Acceptable up to 1 day
Unacceptable Condition

Blood or Bone marrow in EDTA tube

 

Frozen specimen

 

Urine less than 40mL

Special instructions Please consult Microbiologist for stool samples.

 

Methodology

Conventional Culture

Days and Times Performed

Monday through Sunday, TAT 8 weeks

Reference Interval

Acid fast bacilli not isolated after 6 weeks’ incubation in liquid medium and 8 weeks’ incubation in solid medium.

 

Critical Values: Requesting clinician/ location will be informed of positive AFB smear or when Mycobacterium tuberculosis Complex is isolated.

Testing Laboratory

National University Hospital

Clinical Microbiology, 67724343

Useful For

Diagnosis of Mycobacterium infection.

Update

Last updated 31/7/2026

LOINC Laboratory Code

6463-4