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Summary of type of Gram stain errors
| Type (no.) and nature of Gram stain error | No. of samples |
|---|---|
| False-negative smear (50) | |
| No. of organisms | 60 |
| Gram-positive cocci | 28 |
| Gram-negative bacilli/coccobacilli | 19 |
| Gram-positive bacilli | 5 |
| Yeast | 8 |
| False-positive smear (12) | |
| No. of organisms | 12 |
| Gram-positive bacilli | 1 |
| Gram-negative bacilli/coccobacilli | 2 |
| Other | 9a |
Nine sputum specimens that should have been rejected as per the laboratory criteria.
