Parkway Lab - CLOSED is a diagnostic laboratory that offers many services, including clinical laboratory services, pathology laboratory services, and blood tests. Visit Parkway Lab - CLOSED located at 2342 Professional Parkway, Santa Maria, CA. This Santa Maria diagnostic laboratory is one of the best in California. As part of the Dignity Health network, Parkway Lab - CLOSED is dedicated to delivering high quality, compassionate care and access to Santa Maria and nearby communities.