Medical Researchers Use Light to Quickly and Easily Measure Blood’s Clotting Properties

It doesn't say directly but I wonder if this would replace the blood draws for INR.
http://www.biosciencetechnology.com/news/2014/02/medical-researchers-use-light-quickly-and-easily-measure-blood%E2%80%99s-clotting-properties?#.UwvxmIWthEM