Categorisation of the investigations by diagnostic usefulness
| A | B | C | D | |
|---|---|---|---|---|
| A, specific diagnosis or a short list of specific diagnoses given; B, described as inflammatory or non-inflammatory only (“ball park diagnosis”); C, no diagnosis despite an adequate specimen; D, inadequate specimen. | ||||
| Fluid | 44 | 53 | 1 | 5 |
| Biopsy | 54 | 45 | 2 | 2 |