Journal of Laboratory Medicine and Quality Assurance

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Table. 1.

Table. 1.

WHO AFB stain interpretation classification

WHOMicroscopy system used

Bright field 1,000×Fluorescence 200×Fluorescence 400×
NegativeNo AFBNo AFBNo AFB
Scanty1–9/100F1–29/30F1–19/40F
1+10–99/100F30–299/30F20–199/40F
2+1–10/F*10–100/F*5–50/F*
3+>10/F*>100/F*>50/F*

Abbreviations: WHO, World Health Organization; AFB, acid-fast bacilli.

At least 50 fields.

J Lab Med Qual Assur 2019;41:82-104 https://doi.org/10.15263/jlmqa.2019.41.2.82
© 2019 J Lab Med Qual Assur