Warfarin Calculators 🩸
Use these calculators to assess bleeding risk and dosing for patients on Warfarin.
Tools Included
- Warfarin – Bleeding & Reversal Tool
- Warfarin – Dosing Tool
- Review warfarin topic below for more information and guidance on warfarin management
Related Topics
Warfarin Bleeding & Reversal Tool
For trained clinicians. Always follow local/hospital protocols.
Bleeding Risk Factors
Higher risk when INR >5:
- Age >70
- Previous bleeding complications
- GI ulcers/haemorrhage
- Prior CVA
- Recent surgery
- Uncontrolled blood pressure
- Recent initiation of anticoagulants
Reversal Plan
Warfarin – Reversal & Bleeding Plan
No bleeding.
Enter INR to view specific actions.
No intervention required until further information; continue routine INR monitoring per local protocol.
Additional Information
Most over‑anticoagulated patients return to therapeutic range within ~3 days of stopping warfarin.
Monitor: repeat INR per above; more frequent if PCC given (30–60 min, ~6 h, then as guided).
Follow local policy; doses may vary by hospital protocol. Discuss prosthetic valve cases with cardiology/haematology.
Warfarin Dosing Tool
Initiation & maintenance dosing guidance
Dosing Plan
Warfarin Initiation Plan
Day: 1
Sensitive: No
INR: —
Suggested dose: 5–7.5 mg
Rules: if INR ↑ >0.5 consider ↓ dose; if INR ↑ ≥1.0 consider holding 1 dose.
Guidance tool only. Individualise per clinical scenario. Prefer home tablet strength at discharge; if changed, counsel and update pharmacy records.