Table 4.
Missing preoperative laboratory values
| Laboratory variable | Number of missing values | Percent missing |
|---|---|---|
| Na | 12,262 | 14 |
| BUN | 14,438 | 16 |
| Cr | 12,607 | 14 |
| Albumin | 54,870 | 62 |
| Bilirubin | 56,020 | 63 |
| AST | 55,153 | 62 |
| AlkPhos | 56,268 | 64 |
| WBC | 8652 | 10 |
| HCT | 7830 | 9 |
| Plt | 8697 | 10 |
| PTT | 39,175 | 44 |
| INR | 33,575 | 38 |
| PT | 70,892 | 80 |
Total number of values = 88,471; Na = sodium; BUN = blood urea nitrogen; Cr = creatinine; AST = aspartate transaminase; AlkPhos = alkaline phosphatase; WBC = white blood cell count; HCT = hematocrit; Plt = platelets; PTT = partial thromboplastin time; INR = international normalized ratio; PT = and prothrombin time.