Table 3 Most frequently ordered individual add-on tests
From: Impact of add-on laboratory testing at an academic medical center: a five year retrospective study
| Test | % of Total Add-on Orders | % of Times Test Ordered as Add-on (vs. Routine) |
|---|---|---|
| Magnesium | 4.0 | 5.9 |
| Albumin | 3.8 | 6.5 |
| Alanine aminotransferase | 3.8 | 5.4 |
| Aspartate aminotransferase | 3.8 | 5.5 |
| Bilirubin, total | 3.7 | 6.4 |
| Alkaline phosphatase | 3.4 | 5.8 |
| Gamma-glutamyltransferase | 3.2 | 4.7 |
| Total protein | 3.1 | 6.3 |
| Phosphorus | 3.0 | 6.9 |
| Troponin T | 2.2 | 14.5 |
| Complete blood count | 2.1 | 1.5 |
| Automated white blood cell differential | 2.1 | 2.3 |
| Creatinine | 1.7 | 1.1 |
| Potassium | 1.6 | 1.1 |
| Thyroid stimulating hormone with reflex to free thyroxine | 1.6 | 9.6 |
| Lipase | 1.6 | 15.9 |
| Hemoglobin A1C | 1.5 | 10.2 |
| Prothrombin time/International normalized ratio | 1.5 | 1.8 |
| Basic metabolic panel with calcium | 1.5 | 1.1 |
| C-Reactive protein | 1.4 | 8.1 |
| Lactic acid dehydrogenase | 1.4 | 10.7 |
| Creatine kinase, total | 1.3 | 22.7 |
| Amylase | 1.3 | 15.3 |
| Blood urea nitrogen | 1.3 | 0.9 |
| Calcium, total | 1.2 | 1.3 |