can too much pee on a pregnancy test cause a false positive?
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Even with these safeguards, user error can occur. One of the most common mistakes is taking the test too early during your cycle. This can cause either a false negative or a false positive. It's also important to use the test when your urine isn't diluted excessively with water.
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Chemical pregnancy The most common explanation for a "false positive" is that you really were pregnant when you took the test. "Some women can get a positive pregnancy test and then three days after their period is due, they have a really heavy period," says Lanalee Araba Sam, M.D., an ob-gyn in Fort Lauderdale.
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Presumably, water will give a negative result (we hope!), but you still can't then add your urine to the strip as well. If you reuse a strip that has gotten wet — either with water or urine and even if it's dried — you may get a false positive. That's because as an HPT dries, an evaporation line can appear.
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Another common reason for getting a false negative is not having enough hCG in your urine. This may happen if you drank a lot of water, diluting your urine. This may also happen if you took the test later in the day. The hCG concentration is higher when you've held your urine for a while.
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Before your test, make sure to drink plenty of water so you can give an adequate urine sample. However, drinking excessive amounts of water may cause inaccurate results.
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Standard urine pregnancy tests will detect the HCG level when it reaches 20-50 milliunits/milliliters. If you take a test too soon (before you've missed your period), the levels of HCG may not be high enough to detect a pregnancy and it could cause a negative result, even though you're actually pregnant.
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Yes, wrong pregnancy test results can and do happen. In fact false negatives – where the pregnancy test says you're not pregnant but you actually are – are more common than false positives.
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While false negatives are very common, a false positive – where a pregnancy test tells you you're pregnant when you aren't – is extremely rare. That's because there are very few circumstances when your body would produce hCG without being pregnant.
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False negative pregnancy tests are much more common than false positives. While a urinary tract infection (UTI) is unlikely to cause a false negative it could do so, at least in theory. If you have a UTI, see a doctor and then retake the test a few days later.
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Home pregnancy tests You'll either urinate on a pregnancy dipstick, or urinate in a cup and then put the dipstick in the urine. You'll wait a few minutes for the results. At-home pregnancy tests claim to be about 99 percent accurate. But they can sometimes result in a false positive or a false negative.
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Pregnancy test: A corpus luteum cyst can cause a false positive on a pregnancy test.
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A false positive can be the result of the fact that in many fertility treatments, hCG is given to “trigger” ovulation and may remain in the blood. A false negative might occur because a low level of hCG may be undetectable in a urine test despite a pregnancy starting.
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It's possible to get a negative result from a home pregnancy test when you're actually pregnant. This is known as a false-negative.
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Share on Pinterest After an abortion or miscarriage, a home pregnancy test may produce a false-positive result, since the levels of hCG in the body may still be relatively high. Taking a home urine pregnancy test, following an abortion or miscarriage, can be another reason for a false-positive result.
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It is possible to get a false negative on a pregnancy test (where the test says you're not pregnant, even though you are), particularly if you've tested before your period is due. If you've just had one negative result, you could try waiting for a few days and testing again, just to be sure.
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Could a positive result be wrong? Although rare, it's possible to get a positive result from a home pregnancy test when you're not actually pregnant. This is known as a false-positive.
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If you are not using first-morning urine, this portion of the test may be inaccurate. However, the actual result indicating whether or not you're pregnant is accurate. The time estimate may be inaccurate because the amount of hCG in the urine may be different depending on when you take the test.