Rating scales used to assign values to the occurrence (O), severity (S), and detection (D) scores in the failure mode and effect analysis of the drug administration process
| Occurrence (O)| | Severity (S) | Detection (D) | |||
|---|---|---|---|---|---|
| Score | Failure mode probability | Score | Description of injury | Score | Likelihood of detection |
| 1 | Remote: failure unlikely to occur (happening in 1 in 10000 episodes observed) | 1 | No injury or patient monitoring alone | 1 | Very high: detected 9/10 times |
| 2 | Low: relatively rare failure (happening in 1 in 1000 episodes observed) | 2 | Temporary injury needing additional intervention or treatment | 2 | High: detected 7/10 times |
| 3 | Moderate: occasional failure (happening in 200 episodes observed) | 3 | Temporary injury with longer hospital stay or increased level of care | 3 | Medium: detected 5/10 times |
| 4 | High: recurrent failure (happening in 1 in 100 episodes observed) | 4 | Permanent effects on body functions | 4 | Low: detected 2/10 times |
| 5 | Very high: common failure (happening in 1 in 20 episodes observed) | 5 | Death or permanent loss of major body functions | 5 | Remote: detected 0/10 times |
The risk priority number (RPN) is calculated by multiplying the O, S and D scores.