Mycobacterium tuberculosis, NAA With Acid-fast Smear and Culture and Reflex to ID and Susc. Testing*

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Turnaround Time: 43 - 56 days
CPT Code:

87556, 87206, 87116

Reference Range:

M tuberculosis, NAA Negative
AFB Specimen Processing
Acid Fast Smear Negative
Acid Fast Culture Negative
No acid fast bacilli isolated after 6 weeks.


Detect and identify Mycobacterium tuberculosis in specified specimen types.

This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).

Collection Details:

Patient Preparation:

When collecting sputum, have the patient brush teeth, remove dentures, and rinse mouth with water. Instruct the patient not to collect saliva. When collecting aspirates, use standard aseptic preparation. Lung respiratory tissue may be fresh or frozen; no fixative.

Collection Instructions:

Specimen processing (ie, N-acetyl-L-cystine-sodium hydroxide treatment or equivalent, concentration, grinding, both or neither), mycobacterial culture, and smear when appropriate (smears are not performed on blood or when there is less than 2 mL of fluid). Identification by DNA probes or sequencing will be performed at an additional charge. This culture will often detect Nocardia species and other aerobic actinomyces, and identification appropriate for these organisms will be included.

Sterile screw-cap container; seal cap tightly.

If the specimen is to be split for additional testing, it should be divided so that each portion is transported at the appropriate temperature.