What is the therapeutic range for INR?

What is the therapeutic range for INR?

• A. 1-2
• B. 2-3
• C. 0.8-1.2
• D. 3-4

Answer: (B)

INR shows how long it takes for blood to clot and is adjusted to a therapeutic level when someone is on warfarin. For most indications, the goal is an INR of about 2.0 to 3.0, which balances preventing clots with avoiding bleeding. Values below this range are considered subtherapeutic and increase clot risk, while values above this range raise the chance of bleeding. The normal, untreated range is roughly 0.8 to 1.2, which is not suitable for anticoagulation. (Some high-risk valve patients may have a slightly different target, but 2.0–3.0 is the typical range.)

INR shows how long it takes for blood to clot and is adjusted to a therapeutic level when someone is on warfarin. For most indications, the goal is an INR of about 2.0 to 3.0, which balances preventing clots with avoiding bleeding. Values below this range are considered subtherapeutic and increase clot risk, while values above this range raise the chance of bleeding. The normal, untreated range is roughly 0.8 to 1.2, which is not suitable for anticoagulation. (Some high-risk valve patients may have a slightly different target, but 2.0–3.0 is the typical range.)