Clinical decision-making often involves uncertainty due to vague guidelines and incomplete patient data. HL7 Arden Syntax addresses this challenge by incorporating fuzzy logic, enabling nuanced reasoning beyond mere Boolean values. Through practical examples, this paper explores key fuzzy connectives—and, or, not, at least, and at most—and their application in medical logic. We show that Medexter’s ArdenSuite implements these connectives properly and illustrate how fuzzy logic enhances the expressiveness of Arden Syntax, making it a valuable tool for clinical decision support.