| PROCESSES | FAILURES | NUMBER OF PRIORITY |
| Preanalytical | Not sample | 42 |
| Hemolysed sample | 42 | |
| Clotted sample | 36 | |
| Insufficient sample amount | 36 | |
| Wrong container/incorrect sample | 30 | |
| Analytical | Incorrect interpretation of internal control results | 42 |
| Lack or inappropriate staff training | 36 | |
| Problems of method or analytical mode | 32 | |
| Wrong internal controls | 30 | |
| Validation patient results before internal controls | 30 | |
| Postanalytical | Results not entered in the database | 30 |
| Misinterpreted results | 28 | |
| Misidentification among patients | 24 | |
| Error of decimal result | 18 | |
| Informed test with wrong results | 18 | |
| Strategic | Wrong Management of the corrective and improvement actions | 10 |
| Failures in the organization of the indicators in preanalytical processes | 3 | |
| Failures in the organization of the indicators in analytical processes | 3 | |
| Failures in the organization of the indicators in postanalytical processes | 3 | |
| Poorly-defined responsibility | - | |
| Support | Failure of reagent delivery (outstanding stocks) | 7 |
| Error of staff competence | 7 | |
| Lack or inappropriate health training | 7 | |
| Power blackouts not notified during working hours | 7 | |
| Failure of replacement of staff | 6 |