Objective. This study examined ways in which race/ethnicity has been c
onceptualized and used in the health services research literature as p
ublished in Health Services Research (HSR). Data Source. All articles
published in HSR from its inception in 1966 to 1990.Study Design. The
analyses were restricted to U.S.-based empirical research on humans or
in which human population characteristics are described. This study i
dentifies the terms used for race and/or ethnicity, the frequency with
which they occur, and the purposes for which they are utilized. Princ
ipal Findings. The study documents that race/ethnicity is widely used
in the health services literature to stratify or adjust results and to
describe the sample or population of the study. Terms used for race a
re seldom defined and race is frequently employed in a routine and unc
ritical manner to represent ill-defined social and cultural factors. C
onclusions. Researchers and practitioners must give more careful atten
tion to the conceptualization and measurement of race. An understandin
g of racial/ethnic differences in patterns of health service utilizati
on will require efforts to catalog and quantify the specific social an
d cultural factors that are differentially distributed by racial and e
thnic status.