Table 2.
Patient characteristics
| Characteristic | n (%) |
|---|---|
| Age, y | |
| Mean | 61 |
| Range | 18-92 |
| Male | 247 (60) |
| Heparin type | |
| Unfractionated | 339 (82.9) |
| Low molecular weight | 44 (10.8) |
| Both | 6 (1.5) |
| Incidental*/no heparin exposure | 20 (4.9) |
| Indication for heparin | |
| VTE treatment | 41 (10) |
| VTE prophylaxis | 238 (58.2) |
| Perioperative bridging | 7 (1.7) |
| Cardiac surgery/bypass | 72 (17.6) |
| Balloon pump | 14 (3.4) |
| Other/incidental* | 37 (9) |
| 4Ts score category | |
| Low (0-3) | 284 (69.4) |
| Intermediate (4-5) | 98 (24) |
| High (6-8) | 27 (6.6) |
| ELISA OD | |
| Mean | 0.22 |
| Range | 0.01-2.89 |
| Very strong positive (≥2.0) | 7 |
| Strong positive (≥1.0 <2.0) | 19 |
| Weak positive (>0.3 <1.0 [UW] or ≥0.4 <1.0 [Mayo]) | 23 |
| Negative | 360 |
| HIT+ | 17 (4.2) |
*
Incidental includes central line flushes and dialysis.