Laboratory testing for von Willebrand factor contains variables that can result in difficulty in diagnosing the disease. Which of the following factors is identified as a variable that can contribute to this difficulty?

IV medication is administered in which one of the following manners?

Drops per hour Drops per second Drops per minute Drops per 24-hour period

Under this care model, the primary care physician acts as a "gatekeeper" to coordinate the patient care across providers by addressing preventive, acute, and chronic care needs and by providing the patient with access to electronic tools

A) Health information exchange organization B) ?Patient-centered medical home model C) Pay-for-performance (P4P) D) ?Patient safety organization (PSO)