Recent efforts have standardized definitions and classification systems for acute kidney injury (AKI) and chronic kidney disease (CKD). These efforts have enhanced communication, recognition, and awareness of acute and CKDs and stimulated research on both disorders. However, abnormalities of kidney function and structure can occur that do not meet the current criteria for either disorder. Recognizing the need for a uniform approach encompassing both acute and chronic abnormalities of kidney function and structure, the Kidney Disease Improving Global Outcomes 2012 Clinical Practice Guideline for AKI Guidelines proposed an operational definition for acute kidney diseases and disorders (AKD) that encompasses both AKI and any newly recognized kidney disease that does not meet the current definitions for AKI or CKD. Recent commentaries have highlighted that it may be premature to adopt these criteria into clinical practice, but that they may be useful for application in epidemiologic studies. Future research is needed to better understand the clinical characteristics, incidence, and prognosis of AKD, as well as the implications of case identification based on the AKD criteria.

Keywords:
Acute kidney injury, Chronic kidney disease, Classification
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2015
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