A teardown of a digital pregnancy test has created a buzz after revealing it contained a standard paper test, similar to those used by GPs.
The experiment has raised questions about whether the extra cost of digital pregnancy tests is justified.
Some say the electronics give women a clearer answer but others point to the e-waste created by digital test kits.
The experiment also found the digital test contained a microprocessor more powerful than early home computers.
But the electronics themselves did not play a role in the hormone detection.
image captionThe electronics inside a digital pregnancy test do not analyse urine
image captionThe actual testing is done on a standard paper strip inside the digital stick
image captionLEDs light up the strip and two light sensors detect whether the test has reacted
image captionThe result is then displayed in words on the screen
Digital pregnancy tests that display the words “pregnant” or “not pregnant” on a screen often cost about four times as much as ones that simply provide a single or double line on a paper strip to indicate pregnancy.
For the experiment, Foone used a Walmart Equate digital pregnancy test. The inner workings are similar to those in other brands including Procter and Gamble’s Clear Blue and the Boots own-brand digital pregnancy test.
Foone was surprised to find the testing element inside was basically a standard paper test.
Paper test strips detect a hormone called human chorionic gonadotropin, which is produced during pregnancy. The test strip is treated with a chemical that changes colour when the hormone is present.
The electronics simply read the result from the paper test and then displayed the “pregnant” or “not pregnant” read-out.
The circuit board featured a “surprisingly complicated chip”, more powerful than the CPU used in the original IBM PC.
Foone concluded that digital tests were “probably not worth the money”, given that paper strip tests can cost as little as 20 cents (15p).
“It’s a scam, basically,” they wrote on Twitter. “Computers are cheap now. People are buying the digital one thinking it’s the more accurate fancy model, but it is the same.”
However, others pointed out that paper tests could be misread and judging the result of the test was subjective.
“It is not stupid or wasteful to use a hardware interface to help women with this,” said tech YouTuber Naomi Wu.
“I can see a faint line, another person doesn’t see anything,” he said.
Taking pregnancy tests apart appears to be a fairly frequent phenomenon on Twitter.
image captionThe tablet inside a pregnancy test absorbs moisture and is toxic to eat
Also contained within the test is a moisture-absorbing tablet, to keep the circuitry dry before it is used.
It has been incorrectly suggested on social media that this is an emergency contraceptive pill hidden inside the test.
One video suggesting this has been viewed 4.5 million times on Twitter.
In fact, the moisture-absorbing tablet is toxic and should not be eaten.