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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
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