The relationship between the professional background of the physician requesting the biopsy procedure (whether non-specialist or specialist in hepatology/gastroenterology) and the subsequent decision of treatment of the patients was analyzed. Treatment was divided into two categories named arbitrarily "no therapy" (general supportive measures) or "therapy" (causal treatment based on active drugs or measures aimed at affecting the cause of the disease). Of the 204 cases of outpatient needle biopsies available for study, 157 were made by specialist request and 47 were made by a non-specialist request. Sixty-eight (43%) of the former, but only 3 (2%) of the latter had "therapy" (p = 0.0001). Also, patients in which histology showed chronic active liver disease had "therapy" more frequently (49 of 109, 44.9%) than those without chronic active liver disease (22 of 95, 23%) with p less than 0.01. However, patients with histological active chronic disease were not more frequent among specialist requests (56.6%) than among the non-specialist requests (42.5%). But among patients attended by the specialist, there were more patients (31.8%) with positive serum markers of Hepatitis B virus infection than among those sent by others (12.7%) with p less than 0.01. We conclude that at least in the premises in which this study was carried out, blind liver biopsies will lead to active treatment more often in patients treated by a specialized physician, because these patients are more likely to have a virus identified as the cause of their liver disease and consequently will receive antiviral treatment.(ABSTRACT TRUNCATED AT 250 WORDS)