Taxonomy of diagnostic error dimensions
| Process dimension | Description | Example |
| Provider–patient encounter | Problems with history, physical exam, or ordering diagnostic tests for further work-up | Significant symptoms are not noted or acted upon at the time of the encounter |
| Diagnostic tests | Problems with ordered tests either not performed or performed/interpreted incorrectly | Incorrect laboratory test result due to mislabelled specimen |
| Follow-up and tracking | Problems with follow-up of abnormal diagnostic test results or scheduling of follow-up visits | No follow-up of an abnormal x-ray despite suspicious finding |
| Referrals | Lack of appropriate actions on requested consultation or communication breakdown from consultant to referring provider | Consultant requests additional information from referring provider, but referring provider does not respond to the enquiry |
| Patient-related issues | Low adherence to following physician recommendations and/or seeking care, failure to provide critical history information | Patient does not show up for a scheduled diagnostic test |