Table 1 Extended INR testing policies by anticoagulation clinic
Definition of “stable warfarin patient” | Maximal allowed INR testing interval | |
|---|---|---|
Clinic 1 | 12 weeks without maintenance dose change and no out of range INRs | 10 weeks |
Clinic 2 | 6 months without a weekly dose change and no INRs >10% above/below therapeutic range | 12 weeks |
Clinic 3 | 6 months without a weekly dose change and no INRs >10% above/below therapeutic range (both have to be met) | 6 weeks |
Clinic 4 | 10 weeks of no INRs > 10% above/below therapeutic range | 6 weeks |
Clinic 5 | 4 months without any INRs >10% out of range and no weekly dose change | 6 weeks |