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Vanderbilt Pathology Laboratory Services

Test Directory



STAIN AFB MYCOBACTERIUM (AF7)

Department: Microbiology
Test Synonym(s): AF7, Acid Fast Bacilli, AFB smear
Test Components: AFB smear
CPT Codes: 87206
Methodology: Flurochrome stain; positives confirmed with Kinyoun's stain
Reference Range: Negative for acid fast bacilli
Tube Type: Sterile container
Specimen: Specify source
Temperature: Room temperature
Stability: Send to lab immediately
Reasons for Rejection: Contamination of specimen, specimen not received in appropriate sterile container, excessive delay in transport.
Days Performed: Respiratory specimens are performed daily; all others are performed Monday - Friday.
Times Performed: Once per day
TAT: 1 - 3 days (respiratory specimens have a preliminary report in 24 hours)
Significance: Acid fast stain, as a stand alone test, has a poor negative predictive value.
Special Instructions: AFB stain is included with most AFB cultures; see culture for specific site.

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