What is the therapeutic (normal/target) range for INR in a patient taking warfarin?

For most standard indications (such as atrial fibrillation or DVT prophylaxis), the target therapeutic INR range on warfarin is 2.0–3.0. Higher target ranges (e.g., 2.5–3.5) are used for specific higher-risk indications like certain mechanical heart valves, but 2.0–3.0 is the standard/most commonly cited range.