Background/aims: Recent studies suggested NAFLD is less infrequent in African Americans (AA) than in Caucasians but it is unclear if this difference is biological or due to under-recognition/under-referral. This study examined if there is an ethnicity-based difference in obtaining liver biochemistries or evaluating abnormal liver biochemistries by primary care physicians.
Methods: This study consisted of 45,016 AA and 49,660 Caucasians seen at our primary care clinics over a 3-year period. From these two groups, we identified patients with elevated aminotransferases (AA: 3676, Caucasians: 4644) and elevated bilirubin (AA: 1295, Caucasians: 1199) based on predefined criteria. Subsequently, we assessed the proportion of patients in each group who had liver-specific evaluation (viral serologies, abdominal imaging or GI clinic visit).
Results: Among patients with elevated aminotransferases, compared to Caucasians, AA did not have lower testing for viral hepatitis (26% vs. 25%), imaging (16% vs. 13%) or GI clinic visits (17% vs. 17%). Similarly, we did not observe clinically significant difference in the evaluation of elevated bilirubin between AA and Caucasians (viral serologies: 22% vs. 22%; imaging: 25% vs. 27%; GI clinic: 15% vs. 21%).
Conclusions: Under-recognition and under-referral are not likely to explain the reported ethnic differences in the prevalence of NAFLD.