FOR a chronic disease problem to justify the institution of a public health service program, it must conform to essentially the same criteria as other disease problems: (a) there must be available either a means of prevention or an effective treatment, (b) the problem must be of such a nature that it (or a, significant part of it) cannot be solved by the traditional physician-patient relationship, (c) the problem must affect a significant number of people, and (d) it must have community significance. Casefinding in diabetes mellitus conforms to the above criteria. Although no method of primary prevention is known other than control of heredity (which in our present society is not very practicable), early diagnosis and continuous medical supervision can prevent the early complications of diabetes, and some of the late complications can be avoided or postponed (la). Relatively few people have formed the habit of presenting themselves for routine physical checkups, with the result that no opportunity is presented to diagnose an estimated 50 percent of those who have diabetes. The problem is large; it is estimated that there are over 2 million diabetics in the United States (ib), half of whom are unknown. Finally, the disease has an important degree of significance to the community, as it causes a considerable amount of disability, prema,ture death, loss of productivity, and increased demands on health and welfare facilities (2). Diabetes detection programs have been conducted for some years and are an accepted part of the public health scene. There are many types of programs, which vary, in time, from 1-day drives to year-round activities, and in technique, from rapid screening for sugar in the urine to exact, painstaking, and expensive blood determinations. Justification for thel operation of a diabetes detection program is based on the hypotheses that diabetes mellitus is often unrecognized and asymptomatic in the adult; that early diagnosis and treatment of diabetes improves prognosis and reduces complications; and that it is practical to screen postprandial hyperglycemic individuals from the general population by means of a community-operated clinic seirvice (3). One of the best methods of conducting such a screening program is by means of the test developed by Wilkerson and Heftmann (4), using the clinitron. This apparatus provides a rapid, inexpensive, and reasonably accurate method of screening large groups of people. Permanent, year-round diabetes screening programs using the clinitron seem to have been restricted thus far to urban populations. On March 1, 1958, the Glens Falls District Office of the New York State Health Department began a continuous screening program in a rural section of upstate New York, including Saratoga, Warren, and Washington Counties. Data during the first 10 months of operation are presented in the hope that they will contribute toward closing the gap between urban and rural public health practice in diabetes screening. The population of this tricounty area approximates 177,000, 25 percent of whom live in Dr. Meyer was health officer for the Glens Falls District, New York State Department of Health, at the time this paper was written. He is now director of health in Bucks County, Pa.