Table II.
Preoperative laboratory results.
| Preoperative blood marker | TKA cohort (2011 to 2018) n = 137,969 |
THA cohort (2011 to 2018) n = 78,532 |
|---|---|---|
| Albumin | ||
| Mean albumin g/l (SD) | 41.1 (0.37) | 41.5 (0.39) |
| Low (0 to 34 g/l), n (%) | 5,253 (3.8) | 2,658 (3.4) |
| Normal (35+ g/l), n (%) | 132,716 (96.2) | 75,874 (96.6) |
| HCT | ||
| Mean HCT L/L (SD) | 41.0 (4.1) | 41.2 (4.2) |
| Low (Male < 45 L/L, Female < 37 L/L), n (%) | 43,239 (31.3) | 28,020 (35.7) |
| Normal, n (%) | 94,730 (68.7) | 50,512 (64.3) |
| Platelets | ||
| Mean platelets 109/l (SD) | 245.0 (66.6) | 248.5 (67.7) |
| Low (0 to 139 × 109/l), n (%) | 4,248 (3.1) | 2,142 (2.7) |
| Normal (140+ × 109/l), n (%) | 133,721 (96.9) | 76,390 (97.3) |
| WBC | ||
| Mean WBC 109/l (SD) | 7.0 (2.1) | 7.0 (2.3) |
| Low/Normal (0 to 11 × 109/l), n (%) | 133,222 (96.6) | 75,592 (96.3) |
| High (12+ × 109/l), n (%) | 4,747 (3.4) | 2,940 (3.7) |
| eGFR | ||
| Mean eGFR, ml/min/1.73 m2 (SD) | 82.2 (24.4) | 84.7 (25.4) |
| Severe (< 30 ml/min/1.73 m2), n (%) | 1,022 (0.7) | 574 (0.7) |
| Mild/Moderate (30 to 89 ml/min/1.73 m2), n (%) | 102,066 (66.7) | 49,073 (62.5) |
| Normal (≥ 90 ml/min/1.73 m2), n (%) | 44,881 (32.5) | 28,885 (36.8) |
| Sodium | ||
| Mean sodium, mmol/l (SD) | 139.8 (2.8) | 139.7 (2.8) |
| Low (< 135 mmol/l), n (%) | 4,808 (3.5) | 3,173 (4.0) |
| Normal (135 to 147 mmol/l), n (%) | 132,889 (96.3) | 75,222 (95.8) |
| High (≥ 148 mmol/l), n (%) | 272 (0.2) | 137 (0.2) |
eGFR, estimate glomerular filtration rate; HCT, hematocrit; preop, preoperative; SD, standard deviation; THA, total hip arthroplasty; TKA, total knee arthroplasty; WBC, white blood cell count.