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AFB Smear Microscopy Grading system
| Findings | Grade |
|---|---|
| No acid-fast bacilli found in at least 100 fields | Negative |
| 1–9 acid-fast bacilli per 100 fields | Scanty (report exact figure/100) |
| 10–99 acid-fast bacilli per 100 fields | 1+ |
| 1–10 acid-fast bacilli per field in at least 50 fields | 2+ |
| More than 10 acid-fast bacilli per field in at least 20 fields | 3+ |
