Warfarin scheme - reference ranges
These reference ranges are to help with interpreting results for
patients on a Warfarin scheme.
| Day |
APTT (9-10am) target |
Heparin dose |
IF INR |
Warfarin dose given at 5pm |
| 1 Start |
2-3 ratio |
As per APTT |
< 1.4 |
10 mg |
| 2 |
- |
As per APTT
|
< 1.8
1.8
> 1.8
|
10 mg
1 mg
0.5 mg |
|
3
|
2-3 ratio
|
As per APTT
|
< 2.0
2.0-2.3
2.4-2.7
2.8-3.1
3.2-3.4
3.5-4.0
> 4.0 |
10 mg
5 mg
4 mg
3 mg
2 mg
1 mg
NIL |
|
4
|
- |
Stop Heparin |
<1.4
1.4
1.5
1.6-1.7
1.8
1.9
2.0-2.1
2.2-2.3
2.4-2.6
2.7-3.0
3.1-3.5
3.6-4.0
4.1-4.5
>4.5 |
Predicted Maintenance
>8 mg
8 mg
7.5.mg
7 mg
6.5 mg
6 mg
5.5 mg
5 mg
4.5 mg
4 mg
3.5 mg
3 mg
Nil then 2mg
Nil for two days and then 1 mg |
