Marian Regional Medical Center - Lab - CLOSED is a diagnostic laboratory that offers many services, including clinical laboratory services, pathology laboratory services, and blood tests. Visit Marian Regional Medical Center - Lab - CLOSED located at 1400 East Church Street, Santa Maria, CA. This Santa Maria diagnostic laboratory is one of the best in California. As part of the Dignity Health network, Marian Regional Medical Center - Lab - CLOSED is dedicated to delivering high quality, compassionate care and access to Santa Maria and nearby communities.