By the WoundSource Editors
Before the mid-1990s, venous disorders and disease were classified almost solely on clinical appearance, which failed to achieve diagnostic precision or reproducible treatment results. In response to this, the American Venous Forum developed a classification system in 1994, which was revised in 2004. This classification system has gained widespread acceptance across the clinical and medical research communities, and most published papers now use all or part of the CEAP system (defined in the next section). This system was once again updated in 2020.