23rd February 2024

A 81-year-old woman admitted to the cardiology ward after a recent metallic aortic valve replacement presents with confusion and focal neurological signs.

A 81-year-old woman admitted to the cardiology ward after a recent metallic aortic valve replacement presents with confusion and focal neurological signs. She was started on warfarin after her surgery. Her INR is checked and a CT head obtained which reveals the following:

Select one option which correctly describes the monitoring required for her anticoagulant medication.