Convergence on a standard for representing clinical guidelines: work in health level seven.

Concern regarding patient safety and practice variation has focused attention on clinical guidelines as a way of influencing the behavior of health care providers in order to improve patient outcomes. Despite the abundant number of guidelines produced, their use has been limited, in part because the necessary knowledge is relatively inaccessible at the point of care. In turn, this has led researchers to make guidelines computable so that they can be employed in information systems that provide tailored decision support. A number of different efforts have been mounted to create a standard formalism. Health Level Seven (HL7) is a key international standards development organization. Ongoing work in HL7 attempts to synthesize the best aspects of these efforts, producing along the way shareable components of a guideline representation, such as a common expression language and standard data model. These shareable components require in turn an information architecture that makes available a range of patient data encoded in an appropriate format. Convergence on a standard guideline formalism will facilitate use of guidelines and thus enhance patient care.