Actually, D-dimers alone are used in a low-probability clinical setting, because they are extremely sensitive. When you already have DVT symptoms, the standard

Actually, D-dimers alone are used in a low-probability clinical setting, because they are extremely sensitive. When you already have DVT symptoms, the standard practice is to directly go to ultrasound, which is a much more specific exam. And in case you already have PE symptoms, then most MDs would directly go for the spiral CT. http://www.aafp.org/afp/2012/1115/p913.html http://www.aafp.org/afp/2012/1115/p913.html