Dignity Health Laboratories - Matthew Will Memorial Medical Center is a diagnostic laboratory that offers many services, including clinical laboratory services, pathology laboratory services, and blood tests. Visit Dignity Health Laboratories - Matthew Will Memorial Medical Center located at 850 Fair Oaks Ave, Arroyo Grande, CA. This Arroyo Grande diagnostic laboratory is one of the best in California. As part of the Dignity Health network, Dignity Health Laboratories - Matthew Will Memorial Medical Center is dedicated to delivering high quality, compassionate care and access to Arroyo Grande and nearby communities.