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How do pregnancy tests work? - Tien Nguyen

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TEDEd Animation

Let’s Begin…

Over-the-counter pregnancy tests give potentially life-changing results with a pretty high rate of accuracy. But how do they work? Tien Nguyen explains how each test performs a scientifically rigorous, multi-stage experiment that goes from start to finish in the time that it’ll take you to watch this video.

What would happen if you applied plain tap water to the end of a pregnancy test stick?

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About TED-Ed Animations

TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Educator Tien Nguyen
  • Director Andrew Foerster
  • Artist Mike Ellis
  • Narrator Susan Zimmerman

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