Table 4.
Categories of True Negatives
| Category | N |
|---|---|
| Text fragments in message (e.g. ‘Ferric’) | 83 |
| Vitamins (e.g. ‘Prenatal Multivitamin’) | 42 |
| Peritoneal dialysis solutions | 38 |
| Certain vaccines | 36 |
| Over the counter items (e.g. ‘Eucerin’) | 28 |
| Custom mixture (e.g. ‘GI Cocktail’) | 23 |
| Dummy orders for workflow management | 22 |
| Abbreviations not present in RxNorm | 17 |
| Investigational Drugs not in RxNorm | 12 |
| Brand names not in RxNorm | 7 |
| Non-drug substance (e.g. Avitenet) | 5 |
| Typographical errors in message | 2 |
| Device (e.g. space device for inhaler) | 1 |