SDN Members don't see this ad. (About Ads) So I am looking for more information on Masters in Social Work, mainly in clinical focus (LCSW?) I need some clarification on the difference in the ability to diagnose mental health betwen LCSW and Psy.D/Ph.D psychologist. I heard that LCSW can only do diagnosis, but not psychological tests? I am not even sure what the difference means.