Yes, a finger stick can be used to check INR levels, especially when utilizing a PT INR meter. This method involves obtaining a small blood sample from a finger using a lancet and then applying the blood to a test strip inserted into the meter. The pt inr self testing machine measures the clotting time and calculates the INR value, providing a convenient and less invasive way for individuals on anticoagulant therapy, like warfarin, to monitor their blood clotting status regularly. It promotes at-home testing and enables timely adjustments to medication dosages under medical guidance.