Wound, ostomy, and continence nursing is a nursing specialty involved with the treatment of patients with acute and chronic wounds, patients with an ostomy (those who have had some kind of bowel or bladder diversion), and patients with incontinence conditions (those with issues of bladder control, bowel control, and associated skin care). Nurses in this specialty are often referred to as wound, ostomy, and continence nurses (WOC nurses). They use evidence-based knowledge and skills to manage the care of these patients, whose needs can often be complex. In the United States, certification is available for this specialty from the Wound, Ostomy and Continence Nursing Certification Board; for example, the postnominals "CWON" represent the title of Certified Wound and Ostomy Nurse. There are additional organizations that offer varying levels of certification in this field (e.g., American Board of Wound Management).