What is the target INR for a patient with a mechanical mitral valve.. 2.5-3.5 What is the target INR for a patient with a mechanical mitral valve? A.A 4.0-4.5 B.A 4.0 C.A 3.0-4.0 D.A 2.5-3.5*** E.A 2.0-3.0. Share This: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook