Pediatric Warfarin Protocol (CHEST 2012)
Pediatric warfarin protocol for a target INR of 2.0 to 3.0 (CHEST 2012 with the 2024 ASH/ISTH guideline).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Phase
- Maintenance
- INR
- 1.7
- Loading dose or current dose
- 5 mg
Result: INR 1.7 in maintenance (1.5-1.9): increase by 10%, 5.5 mg.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Phase
- INR (baseline on day 1)
- Day 1 start
- Weight (day 1)
- Loading dose or current dose
How this is calculated
Citation
Monagle P et al. CHEST 2012;141(2 Suppl):e737S-e801S, Table 6, with the band printed "1.15-1.9" read as 1.5-1.9 per Monagle P et al. ASH/ISTH 2024 pediatric VTE guidelines, Blood Adv 2025;9:2587, Table 9. Read the sources: CHEST 2012, Table 6 ↗, ASH/ISTH 2024, Table 9 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.