This is an adaptation of the Chinese kung-work, and ho-together. The Anglicized term gung ho became widely known in English as a slogan that was adopted in WWII by the United States Marines under General Evans Carlson. The New York Times Magazine reported this in 1942:
A white blood cell (WBC) scan is an imaging test that uses a radioactive material called a tracer. It looks for infection or inflammation in the body. It is a type of nuclear scan.
There are 2 types of White Blood Cell Scans we perform: This study is used in more chronic infections which may require longer periods of time before adequate tracer localization, in abdominal imaging, and in patients with fever of unknown origin (FUO).