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Health & Fit6 Things That Can Cause a False-Positive Pregnancy Test

02:25  18 july  2019
02:25  18 july  2019 Source:   self.com

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That can cause a false - positive reading on an at-home pregnancy test . Ectopic pregnancies are medical emergencies. The hormone can remain in your blood and urine for up to six weeks following the end of the pregnancy . It’s possible to have a false - positive test until your hCG levels return to

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6 Things That Can Cause a False-Positive Pregnancy Test© Raimund Koch / Getty Images

A false-positive pregnancy test can be devastating—especially for women who have difficulty conceiving or who are actively trying to get pregnant. The last thing you want is to jump for joy—only to find out later that you’re not actually pregnant. On the flip side, getting a false-positive pregnancy test when you’re actively trying not to get pregnant can be just as horrible. Cue: panicked visit to your ob/gyn, only to learn that you’re actually not pregnant and had nothing to stress about.

Thankfully, false-positive pregnancy tests are rare, but they can happen. Here are some of the most common causes.

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You wanted to know if it's possible to have a falsely positive home pregnancy test result. And it is possible. There are a few things that can cause it.

A pregnancy test tests the presence of hCG in a urine sample and shows it using symbols or lines. Do things like telling people that you’ve missed your periods and you feel some early pregnancy symptoms. Soap can cause a false positive pregnancy test .

It's important to first know how a pregnancy test works.

At-home pregnancy tests check for the hormone hCG. hCG is short for human chorionic gonadotropin, which the body produces during pregnancy. Right after a fertilized egg attaches to the uterine lining, the placenta then forms and it produces hCG, according to the Mayo Clinic. A blood test can detect hCG about 11 days after conception, and a urine test can detect it 12 to 14 days after conception, according to the American Pregnancy Association. A woman’s hCG level typically doubles every 72 hours through eight to 11 weeks of pregnancy. Then it remains consistent and decreases after delivery.

An at-home pregnancy test is designed to detect hCG in urine. If the hormone is present, it triggers a chemical reaction and the test signals that you're pregnant. If hCG is not present, the test will say you aren't pregnant. On many tests, two lines mean you’re pregnant and one line means you’re not—but it depends on the test brand. Some tests use plus and minus signs. Some digital pregnancy tests have a screen that plainly reads "pregnant" or "not pregnant."

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An expired pregnancy test can yield a false positive . The way that over-the-counter pregnancy Taking a drug containing hCG can cause a false positive pregnancy test . It takes between one If there can be a false positive pregnancy test , you may be wondering if there is such a thing as a

Pregnancy Test after IVF gives you a false positive pregnancy test because during infertility therapies doctor gives you ovulation drugs. It only means that the second pregnancy test is false. But a positive pregnancy test and negative result a week later need medical attention.

Seems simple, right? As Ina Garten would say, "How easy is that?" Typically, pretty easy. Most at-home pregnancy tests claim to be about 99 percent accurate, the Mayo Clinic notes. Ultrasounds typically can't detect a pregnancy until week five or six—when a gestational sac first appears—and that's why at-home tests are so useful. But sometimes, other elements can mess with a pregnancy test's results and tell you you’re pregnant when you’re really not.

Here are the most likely reasons you may end up with a false-positive pregnancy test:

1. You let the test sit too long before looking.

If you take a standard pregnancy test with line indicators, it's important to check the results in the time frame instructed. If you let it sit too long before reading the results, urine on the test can evaporate and make it look like you have two lines instead of just one. "Oftentimes people will see evaporation lines as urine starts to evaporate off the test," Jamil Abdur-Rahman, M.D., board-certified ob/gyn, tells SELF. That might cause the test to look like it has a faint second line—making it positive—but it really only has one.

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A false positive pregnancy test is one of the worst things for a woman trying to coneive. After the euphoria of the positive pregnancy test result, your Similarly, other medications like antidepressants and birth control can cause a false positive pregnancy test . You can mistake an evaporation line

Causes of a Negative Pregnancy Test with No Period. One study found that home pregnancy tests only have to detect hCG levels above 25 milli-international units per milliliter (mIU/mL) to achieve the commonly advertised 99 percent accuracy rate.

The best way to avoid this: Read the pregnancy test's directions and follow them exactly. The popular pregnancy test brand First Response, for example, instructs users to wait three minutes after taking the test, then read it as soon as possible.

2. The pregnancy test is expired.

The second most common reason his patients get false positives, Dr. Abdur-Rahman says, is because the test is expired. When a test is past its expiration date, the chemical that detects hCG doesn't always work as it should, and you’re more likely to get a misread. "The test can expire and the chance of having a false positive increases," Dr. Abdur-Rahman says.

3. You’re on fertility medications that raise hCG levels.

If you take a pregnancy test too soon after taking a fertility drug that contains hCG—like some injections that are often part of in vitro fertilization—you could get a false positive.

"[This happens to] women who are very motivated and trying to conceive, and they will often do the pregnancy test early and see a positive result, which is obviously very exciting for them initially," Zev Williams, M.D., ob/gyn and assistant professor in the department of obstetrics and gynecology and women's health at Albert Einstein College of Medicine, tells SELF. "But it just might be the result of the fertility medication that they took. It's something we caution patients about so they don’t get false hope when they see that test is positive."

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However, not all positive pregnancy tests mean that a woman is pregnant . There are some occasions when a pregnancy test can give a false - positive reading. Listed below are five possibly situations which could cause a woman to have a false - positive result from a home pregnancy test .

It may be a false positive pregnancy test result too. It happens if you are suffering from diseases Bleeding after getting positive pregnancy test may be the brown discharge of pregnancy : During early Sex can cause bleeding after getting pregnant . Many women experience depression during

4. You've had an extremely early miscarriage.

You might get your period a few days after a positive pregnancy test and assume you had a false-positive result. However, it could be that you were pregnant but miscarried very early on. “It’s not that the test is wrong—it was completely accurate at picking up the hormone [hCG]," Dr. Williams says. "Unfortunately, this wasn’t a healthy pregnancy." Doctors refer to this early pregnancy loss as a chemical pregnancy.

Most miscarriages occur in the first 13 weeks of pregnancy, and, although there are no real statistics, it’s estimated that many miscarriages occur before a woman even knows she’s pregnant. A chemical pregnancy occurs when a pregnancy is lost shortly after implantation, according to the American Pregnancy Association. Typically, it happens due to chromosomal abnormalities in the fertilized egg. Chemical pregnancies account for 50 to 75 percent of all miscarriages.

People who have a chemical pregnancy often experience bleeding (when they miscarry) right around the time of their expected period, which is why it’s easy to assume you just had a false-positive test result.

5. You have residual hCG in your system after a delivery or miscarriage.

After you give birth or miscarry, hCG can persist in your body for months, Dr. Williams says. The American Pregnancy Association estimates it takes four to six weeks for hCG levels to return to normal after a woman suffers a miscarriage. This is because some of the placenta can be left behind in the body, and it can continue to produce hCG for a short period of time. "As long as there are viable growing placenta cells inside the woman, those tests can be positive," Dr. Williams says.

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What Can Cause False Positive Pregnancy Test Results? A positive result which is not repeatable, with subsequent home pregnancy tests , is usually because of one of these reasons: Chemical pregnancy , missed reaction time, chemical interference or an evaporation line on the

Main causes of false positive . Changes in the result usually happen when the test is out of date and therefore it is very important to confirm the expiration Before using the pharmacy pregnancy test it is important to read the manufacturers instructions, especially about the time it is necessary to wait to

6. You had an ectopic pregnancy.

An ectopic pregnancy happens when a fertilized egg ends up growing outside the uterus—usually in a fallopian tube—instead of inside the uterus, according to the Mayo Clinic. That said, an ectopic pregnancy can also happen in other reproductive areas like the ovary or cervix. An ectopic pregnancy isn’t viable since the embryo isn’t inside the uterus where it can grow and thrive. But the embryo will still produce hCG, which can lead to a false-positive pregnancy test.

According to the Mayo Clinic, an ectopic pregnancy can be life-threatening. Call your doctor right away if you experience any of the following symptoms:

  • Severe pain in your abdomen or pelvis while pregnant
  • Vaginal bleeding (that’s out of the ordinary)
  • Severe dizziness or lightheadedness
  • Any other symptoms that are making you feel worried

If you get a positive pregnancy test, the best thing to do is consult your doctor.

Your ob/gyn can perform a blood test to further examine hCG levels and clear up any potential pregnancy test errors. Dr. Abdur-Rahman says he views at-home pregnancy tests more as "screening tests"—a blood test is a diagnostic test that can actually confirm you're pregnant. If a blood test confirms you're pregnant, your ob/gyn can continue to monitor hCG levels in your blood to make sure the pregnancy is developing properly before an ultrasound can reveal more details.

And if you get a negative pregnancy test, know that a false negative is possible, too. If you take an at-home pregnancy test too early, it might not pick up the hCG hormone. But, as we explained above, those hormones should double every 72 hours with a healthy pregnancy. "The longer you wait, the more likely you are to detect the pregnancy,” Dr. Williams says. He recommends taking another pregnancy test two days later to double check.


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