How do pregnancy tests work Tien Nguyen

View full lesson: Overthecounter pregnancy tests give potentially lifechanging results with a pretty high rate of accuracy. But how do they work Tien Nguyen explains how each test performs a scientifically rigorous, multistage experiment that goes from start to finish in the time that itll take you to watch this video. Lesson by Tien Nguyen, animation by Andrew Foerster.