How do pregnancy tests work? - Tien Nguyen

TED-Ed Channel Youtube
Views 1,785,731 19399 367

Published on Jul 07, 2015

View full lesson:

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.

Lesson by Tien Nguyen, animation by Andrew Foerster.

Categoy: Education

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  • Hưng Gia - Channel Youtube
    Hưng Gia - 20 hours ago

    The name sounds like Vietnamese people names Yay I'm Vietnamese

  • Kaira Everdeen - Channel Youtube
    Kaira Everdeen - 2 days ago

    Who would fuking pee on seeds

  • John Michaelle Santos - Channel Youtube
    John Michaelle Santos - 4 days ago

    Kaloka nung binulsa niya ung syringe. Haha

  • ADgamin g - Channel Youtube
    ADgamin g - 1 week ago


  • Candice Lau - Channel Youtube
    Candice Lau - 2 weeks ago

    But why would a man take a pregnancy test?

  • Whitefang 73005 - Channel Youtube
    Whitefang 73005 - 2 weeks ago

    Just got a baby advert

  • Frank Olilang - Channel Youtube
    Frank Olilang - 2 weeks ago

    Imagine if a pregnant Egyptian women thought the baby was a boy because the barley sprouted first but she gave birth to a girl.

  • Dragonlover99 wolflover99 - Channel Youtube
    Dragonlover99 wolflover99 - 2 weeks ago

    Omg same last name lol

  • jackychung819 - Channel Youtube
    jackychung819 - 3 weeks ago

    This video failed to explain clearly with all these childish animations

  • Jashonna Harvey - Channel Youtube
    Jashonna Harvey - 3 weeks ago

    First of all Egyptians we’re not white

  • XENOS Gaming - Channel Youtube
    XENOS Gaming - 4 weeks ago

    Tien Nguyen is my name what are the chances my parents says my name is the only one 😫🤕😷😟😑😣😥😞😒😩😬😱💀 wtf I'm freaking out

  • Anuj Minhas - Channel Youtube
    Anuj Minhas - 1 month ago

    Human chorionic gonadotropin (hCG)

  • CookieTheDrawing Fox - Channel Youtube
    CookieTheDrawing Fox - 1 month ago

    2:25 ligit just reminded me of puberty

  • New 2016 - Channel Youtube
    New 2016 - 1 month ago

    Can I ask why some pregnancy tests show first a line at the control zone and after 5 minutes a faint line shows up at the test area later?! This has happened twice with me.

  • dan c - Channel Youtube
    dan c - 1 month ago

    All ive got to say is she hasn't drank enough water because her pee is yellow af

  • Isaiah Rosario - Channel Youtube
    Isaiah Rosario - 2 months ago

    If men use it maybe they will be pregnat i think

  • MelonSomething - Channel Youtube
    MelonSomething - 2 months ago

    This 100% unrelated to the video but my friend's name is Tien Nguyen.

  • cAcTUs JADE 344 - Channel Youtube
    cAcTUs JADE 344 - 2 months ago

    Ok now I know what to do if I think I have testicular cancer cuz I’m a boy

  • Tien Huynh - Channel Youtube
    Tien Huynh - 2 months ago

    Tf that’s my name

  • Duvmasta - Channel Youtube
    Duvmasta - 2 months ago

    If a guy uses a pregnancy test and it comes out positive, he has cancer. I think either testicular or prostate I forget which one...

  • Mari_a Stana - Channel Youtube
    Mari_a Stana - 2 months ago

    I’m only 14 Why am i watching this?

  • Jessica Grey - Channel Youtube
    Jessica Grey - 2 months ago

    AYE-SAY lol

  • Suzy Boiii - Channel Youtube
    Suzy Boiii - 2 months ago

    Who else thought of the *ace family*

  • Shawnthewolf 76 - Channel Youtube
    Shawnthewolf 76 - 2 months ago

    I’m a single guy, why tf am I watching this?

  • Neko Remix - Channel Youtube
    Neko Remix - 2 months ago


  • cool dude - Channel Youtube
    cool dude - 2 months ago

    I've been waiting

  • [ Content ] [X] - Channel Youtube
    [ Content ] [X] - 2 months ago

    Oh Ok

  • ENG SUB amature k-pop - Channel Youtube
    ENG SUB amature k-pop - 2 months ago

    I don't know why but I love this narrator susan zimmerman..Her voice is clean and charm💕

  • Ashley Samimi - Channel Youtube
    Ashley Samimi - 2 months ago

    "Prego Presto" ok then

  • somebody toucha ma spaggheti - Channel Youtube
    somebody toucha ma spaggheti - 2 months ago

    one egyptian one seed