congratulations you did it, page-6

http://www.osha.gov/SLTC/etools/oilandgas/glossary_of_terms/glossary_of_terms_d.html

drill stem test (DST) n: a method of formation testing. The basic drill stem test tool consists of a packer or packers, valves or ports that may be opened and closed from the surface, and two or more pressure-recording devices. The tool is lowered on the drill string to the zone to be tested. The packer or packers are set to isolate the zone from the drilling fluid column.