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This research was done to evaluate the "epidemiologic necropsy" procedure as a "screening" technique for disease that has been clinically unsuspected or inactive during life. The post-mortem occurrence rates of gallstones in necropsies at Yale-New Haven Hospital were compared and found reasonably similar to the analogous rates of gallstones detected in-vivo via ultrasonographic screening of large general populations. Because the authors could not find an appropriate in-vivo screening study done in the United States, they used data mainly from screening studies in Copenhagen, Denmark, and Rome and Sirmione, Italy. Two additional ultrasonographic screening studies have been done in Norway and in populations of Hispanic Americans. Previous disparities between post-mortem and in-vivo screening results probably arose because of failure to stratify for age and sex, to remove patients with cholecystectomy from the analysis, or to account for small-size stones that would be detected at necropsy but not with ultrasonography. The current results help confirm the value of the epidemiologic necropsy procedure in estimating the size of the substantial reservoir of undetected disease that does not appear in the customary tabulations of "vital statistics."