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A clinical pharmacy service that determined blood potassium levels was implemented and evaluated in a community pharmacy practice. The pharmacy service utilization model was developed to guide the research. Data were gathered by two questionnaires. The study spanned four weeks at two locations. During one week at each location, blood testing was offered for a fee of $5, and on the other week it was free. A total of 320 subjects filled out a questionnaire. Patient attitude was positive toward the provision of blood level testing service in a community pharmacy. Subjects perceived a pharmacy to be a convenient place for the service, and they stated that they would use such a service if it were available. Subjects stated that they would pay a mean of $12.46 to use the service. Tests they were most interested in having were cholesterol, potassium, and glucose. Of the 320 subjects, 159 had a blood test; 63 paid a fee and 96 received it free. All subjects expressed satisfaction with the service and all said that they would use it again. The mean amount that those tested were willing to pay was $14.49. The proposed model was partially successful in describing the relationships involved in utilization of a clinical pharmacy service. Demographics did not correlate with other variables nor did the two measures of willingness to pay. All other relationships were significant. The service was shown to be financially feasible based on projections from the data collected. It was recommended that such services be implemented.