Harvard economist Robert Dorfman developed pool testing procedures to detect syphilis in US soldiers during World War II, Litvak said. Decades later, Litvak helped research and author pool-testing ...

Ensure the test base is smooth, non-absorbent, and placed on a level surface. Once the slump test has started, it must be completed within 2 minutes and 30 seconds. The Procedure, Step by Step ...