Plus Therapeutics Inc (NASDAQ:PSTV) said its CNSide Diagnostics unit has received accreditation from the College of American Pathologists, a widely recognized standard in laboratory quality, sending shares of the Nasdaq-listed company up 8.7% to $5.89 Thursday. CNSide Diagnostics' Houston-based clinical laboratory underwent a rigorous on-site inspection evaluating clinical protocols, documentation, quality control procedures, personnel qualifications, equipment, facilities, and overall laboratory management.