Question

A 70-year-old with atrial fibrillation is starting on warfarin. According to the BNF, which factor primarily determines warfarin dosing and must be monitored?

Accepted Answer

INR (international normalised ratio)

Answer

PTT (partial thromboplastin time)

Answer

Platelet count

Answer

APTT ratio

Answer

Bleeding time

Practice question

A 70-year-old with atrial fibrillation is starting on warfarin. According to the BNF, which factor primarily determines warfarin dosing and must be monitored?