RESUMO
Nonalcoholic fatty liver disease is the most common cause of liver disease in the Western world. Liver biopsy is considered the gold standard in the diagnosis and progression of the disease and its usefulness cannot be neglected in terms of research. But in current clinical practice, liver biopsy tends to be replaced by less expensive and noninvasive methods allowing the identification of cardiovascular and metabolic risks. Given the fact that a small percentage of individuals with nonalcoholic fatty liver disease will progress to cirrhosis, attention will be focused more on cardiovascular risk as nonalcoholic fatty liver is now regarded as a distinct component of the metabolic syndrome. The aim of the clinician is to identify the early stages of fatty liver, using in this purpose simple and easily accessible methods. Many techniques have been proposed for the diagnosis of nonalcoholic fatty liver, from simple clinical factors (anthropometric indices measuring,blood pressure) laboratory biomarkers, imaging methods and scores, which should allow early treatment. This review describes different methods for identifying nonalcoholic fatty liver and various stages of this disease.