INR (International Normalized Ratio) standardizes prothrombin time results across different laboratories. It is primarily used to monitor blood-thinning therapy.
Category: Coagulation
Also known as: inr, international normalized ratio, pt/inr
Reference range: 0.8–1.1 ratio (Source: ABIM)
Standard unit: ratio
High values may indicate
High INR may indicate increased bleeding risk, excessive anticoagulant medication effect, liver disease, or vitamin K deficiency.
Low values may indicate
Low INR values are normal for people not on blood thinners. In patients on warfarin, a low INR may indicate insufficient anticoagulation and increased clotting risk.