How do pregnancy tests work? - Tien Nguyen

Dig into the science of how modern over-the-counter pregnancy tests detect pregnancy with such a high rate of accuracy.

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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.

[DeidaraIsBestKATS]

If more schools decide to teach sex ed they should totally use these videos

[lukeo.]

I feel bad for the HCG. They do not look happy

[PrinceChris]

impressive how advanced Egyptians were.

[bushputz]

Egyptian child to mother, "Why does this bread taste funny?"

[MissySimpleM]

I really liked learning about the ancient Egyptians' pregnancy test! So cool!

[xiguang]

Wait... So Egyptian wait until next harvest to get the result. I'm pretty damn sure people can tell by their own eyes by then.

[willhelterbrand]

so men can use a pregnancy test to see if they have testicular cancer?

[norr]

Man gets positive on a pregnancy test

“Honey...come here

[apoch]

As a person who designs these tests, you explain it well for a layman. However, there are errors in your description. The secondary antibody doesn't attach a dye. Usually, the colour is produced by a colloidal gold particle (which is pink to red in colour), already attached to the second antibody. When the first zone is crossed, the urine interacts with the particle, but the particle is also moistened and begins to move WITH the urine sample and flow into the other zones where it is captured. You can confirm this by taking apart an unused pregnancy test, and a used one. You will see the "dye" (the gold particle) no longer is present in the first zone on the conjugate pad.

[bluntlyhonest]

If you wait 9 months and no baby comes out, you weren't pregnant

[rickiex]

Better yet, how the Fuk did Egypt think of peeing on some seeds??

[MrBeiragua]

Those egyptians were full of tricks! I woudn't be surprised if they had wheat cars or something hehehe

[tastes-like-straberries]

The fact that the Egyptians realised that the urine was something to test, and the test they designed, for their time this is really impressive!

[СнежныйДжони]

"Yay im pregnant" - guy who doesn't know he has testicular cancer

[lev]

me:
*_i still have my V card but i'm scared to take a pregnancy test._*

[Bram]

0:30 Wow, dem Egyptians... why you so smart?

[TexasAmour]

Fun fact: the urine test you take at the doctor's office is no more specific than the one you take at home. The one that is more specific is the blood test (that's the one that can tell exactly how pregnant you are)

[pantstime]

3:51 doctor: “You were so brave during your tests! Here, have a floating red orb for being such a brave girl!”

[nyssacorreia]

I love how the test was called “Prego Presto”

[stephaniestiller]

Is it weird I want to purchase the shower curtain at 0:50