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Australia Home pregnancy tests will expire, but you may still get an accurate reading

02:45  05 december  2019
02:45  05 december  2019 Source:   businessinsider.com.au

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How pregnancy tests work. Think you might be pregnant ? Home pregnancy tests (HPTs) are quite accurate . They work by detecting the presence of human chorionic gonadotropin (hCG) in the urine If you get a negative result and still don’t have your period within a few days, you should retest.

Urine tests or home pregnancy tests are around 97% accurate when done correctly. Home pregnancy tests are great to use because they If you have received different answers on multiple pregnancy tests , it is recommended that you get a blood test done to get an accurate answer.

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There are two types of pregnancy tests: urine and blood. Both of these test for a hormone called human chorionic gonadotropin (hCG), which women begin producing after implantation. But only one of these tests actually expires.

Pregnancy tests will expire in a couple of years

Blood samples can be taken to test for pregnancy.© Emilija Manevska Blood samples can be taken to test for pregnancy. Blood pregnancy tests do not expire because analysis happens in a laboratory rather than at home.

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Your pregnancy test is negative? But you ’ve missed your period? Perhaps it’s a false negative? Other reasons you may get a negative result on a test when you ’re pregnant could be because Read the instructions on the pack to understand what the brand of test you ’re using means by early

You might be pregnant but still get a negative result on a home pregnancy test because: The test was taken too soon. The test expired or wasn't stored properly. The chemicals that detect hCG in a test will eventually degrade and break down after the expiration date, or they can be damaged from

You can get one at a doctor's office, where they will draw a blood sample to be sent out for testing.

However, the more common urine pregnancy tests, which you can pick up at your local pharmacy, can, and do, expire.

The way pregnancy tests work is that they are coated in a special type of lab-made antibody. Normally, antibodies are proteins that our immune systems produce to fend off infection and disease.

But technicians can also synthesise antibodies in the lab for many different types of tests that can diagnose everything from infectious diseases to pregnancy.

The antibodies in home pregnancy tests react specifically to hCG, but will slowly evaporate and become less effective over time.

"Like many pharmaceuticals, pregnancy tests last for two to three years," Stanford University Professor Paul Blumenthal said.

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Home pregnancy tests are quick and easy to use. Plus, you can test in the privacy of your home , make lifestyle changes, and find prenatal care as soon If you think you may be getting false results or are getting mixed results, check with your doctor and get a blood test to confirm conception (2).

But not all home pregnancy tests were consistently sensitive enough to do so. A woman’s cycle If you think you may be pregnant after a missed period but got a negative result on your pregnancy test You can learn more about how we ensure our content is accurate and current by reading our

Dr Blumenthal, who researches pregnancy tests, said this does not mean the test will last for two years after its purchase.

Pregnancy test.© FotoDuets Pregnancy test. The packet test may have spent a considerable amount of time sitting on a store shelf.

So, customers are urged to always refer to the expiration date on the package to be certain.

Certain conditions can also affect how quickly a pregnancy test can expire.

It is generally recommended to store pregnancy tests at room temperature, or at least between 2 and 320 degrees Celcius.

If a test is left in a blistering hot or freezing cold car, for example, it might be safer to buy a new one.

What happens if is an expired pregnancy test is used?

Because urine tests become less sensitive over time, they will eventually lose their ability to detect pregnancy entirely.

This means, if you use an expired pregnancy test, you are more likely to get an inaccurate result.

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A pregnancy test will be less accurate if it’s expired or if you don’t use it the right way. So always check the expiration date on the package, and carefully read But these results aren’t super reliable, and you may get a false positive or false negative test result. If your periods are very irregular, or you

Many home pregnancy tests claim to be accurate as early as the first day of a missed period — or even before. You 're likely to get more accurate You continue to get negative test results, but your period doesn't begin or you still think you might be pregnant . Check with your health care provider.

Expired pregnancy tests can produce false-negative results.© Deb Drury Expired pregnancy tests can produce false-negative results. Most likely, you will get a false negative, which is when your test says you're not pregnant but you are.

While less common, you can also receive a false positive, when the test says you're pregnant but you're not.

According to Dr Blumenthal, it is possible that you can still get an accurate result from an expired pregnancy test - especially if you're more than a few weeks into your pregnancy and your hCG levels are extremely high.

But he explained that it's best not to chance it and stick with pregnancy tests that are not past their expiration date.

"Avoid using expired tests if at all possible," Dr Blumenthal said.

If you are feeling the symptoms of early pregnancy (nausea and vomiting or breast tenderness for example,) but your pregnancy test came out negative, this may be a good time to double-check the expiration date on the box or go get tested at your doctor's office.

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