Table 4.
Monitoring and record keeping of patients prescribed warfarin
| All warfarin patients (n = 10,802) | Warfarin patients contacted (n = 8696) | |
|---|---|---|
| INR record seen | 3599 (33.3%) | 3283 (37.8%) |
| INR last tested | ||
| Less than 4 weeks ago | 5971 (55.3%) | 5477 (63.0%) |
| Between 4 and 12 weeks ago | 2785 (25.8%) | 2470 (28.4%) |
| More than 12 weeks ago | 120 (1.1%) | 102 (1.2%) |
| Not known | 19,276 (17.8%) | 644 (7.4%) |
| INR value | ||
| Less than 2 | 645 (6.0%) | 603 (6.9%) |
| Between 2 and 5 | 7535 (69.8%) | 6908 (79.5%) |
| More than 5 | 57 (0.5%) | 52 (0.6%) |
| Not known | 2565 (23.7%) | 1130 (13.0%) |
| INR recorded in pharmacy | 3737 (34.6%) | 3330 (38.3%) |
| Required to halve or cut tablets for required dose | ||
| Yes | 548 (5.1%) | 496 (5.7%) |
| No | 8716 (80.7%) | 7698 (88.6%) |
| Not known | 1538 (14.2%) | 499 (5.7%) |
| Reported alternate day dosing regimen | ||
| Yes | 4387 (40.6%) | 4027 (46.3%) |
| No | 4592 (42.5%) | 4013 (46.2%) |
| Not known | 1823 (16.9%) | 653 (7.5%) |
| Patient aware dietary changes can affect anticoagulation | ||
| Yes | 7881 (73.0%) | 7061 (81.2%) |
| No | 1251 (11.6%) | 1140 (13.1%) |
| Not known | 1670 (15.5%) | 492 (5.7%) |
| Prescriber contacted due to safety concerns | 210 (1.9%) | 199 (2.3%) |
INR international normalised ratio