Source:http://linkedlifedata.com/resource/umls/id/C0179874
UMD: Completely enclosed rooms, spaces, or cavities that are kept at a quickly established, controlled, and maintained environment to protect the materials, patients, animals, plants, or substances contained within them from outside contaminants, interference, or conditions. They typically consist of main chambers, transfer chambers, microprocessors, a series of audible and visual alarms to alert operators to altered conditions, compressors, air filters, vacuum pumps, valves, quick response systems, view ports for observation, monitors/controls, and air-lock systems. They also consist of series of compressors, pumps, and controls to create and maintain a specific environment regulated by a programmed microprocessor. Depending on the type of chamber, they are used in pharmaceuticals, laboratories, aeromedical training, emergency medicince, clinical use, experimental science, infection control, hematology, and pathology.