Test | Incidence of abnormalities that influence management, percent | Positive likelihood ratio of postoperative complication, LR+ | Negative likelihood ratio of postoperative complication, LR- |
Hemoglobin | 0.1 | 3.3 | 0.90 |
White blood cell count | 0.0 | 0.0 | 1.00 |
Platelet count | 0.0 | 0.0 | 1.00 |
Prothrombin time (PT) | 0.0 | 0.0 | 1.01 |
Partial thromboplastin time (PTT) | 0.1 | 1.7 | 0.86 |
Electrolytes | 1.8 | 4.3* | 0.80 |
Renal function | 2.6 | 3.3 | 0.81 |
Glucose | 0.5 | 1.6 | 0.85 |
Liver function tests | 0.1 | NA¶ | NA¶ |
Urinalysis | 1.4 | 1.7 | 0.97 |
Electrocardiogram | 2.6 | 1.6 | 0.96 |
Chest radiograph | 3.0 | 2.5 | 0.72 |
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