Table 1:
Trend of laboratory measurements in a 47-year-old woman with warfarin and acetaminophen interaction
| Timeline | INR | Hemoglobin, g/L |
|---|---|---|
| 2 months before admission | 2.5 | 126 |
| Day 1 (on presentation) | > 5.0 | 101 |
| Day 2 (16 h postadmission) | 9.2 | 78 |
| Day 2 (20 h postadmission, 2 h after warfarin reversal) | 0.9 | NA |
| Day 2 (24 h postadmission, 6 h after PRBC transfusion) | NA | 91 |
| Day 3 (morning) | 1.2 | 83 |
| Day 3 (evening) | 1.0 | 77 |
| Day 4 | 1.3 | 75 |
| Day 5 | 1.2 | 71 |
| Day 6 | 1.2 | 74 |
| Day 7 | 1.2 | 74 |
| Day 8 (warfarin restarted) | 1.1 | 76 |
| Day 10 | 1.2 | 89 |
| Day 11 | 1.4 | 97 |
| Day 12 | 1.8 | 91 |
| Day 13 | 1.9 | NA |
| Day 14 | 2.1 | NA |
| Day 15 | 2.3 | 99 |
| Day 16 | 2.5 | NA |
Note: INR = international normalized ratio, NA = not available, PRBC = packed red blood cells.