is it possible to have a false negative on a urine test?
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You may get a negative result when testing early if you're not using the first urine of the day, you drank too much liquid, or the test is not sensitive enough for early testing – even if you're pregnant.
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Could a negative result be wrong? 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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Although many home pregnancy tests claim 99 percent accuracy, they are not perfect. A false-positive result is one where the test indicates that the user is pregnant when she is not. Several factors can lead to a false-positive or a negative reading.
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False negative tests are common. In fact, many women get false negative tests before they get a positive. This is because the body's HCG levels have not yet risen sufficiently high to indicate that a woman is pregnant. In many cases, a woman will later get a positive test if she just waits a few days.
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If your test comes back negative, just try again in the morning. You may get a different result with your first morning urine, as there may have been too little of the hCG hormone in your urine at night to trigger a positive result. Pay attention to the fine print on the pregnancy test pamphlet.
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Modern home pregnancy tests (which use a urine sample to detect the presence of human chorionic gonadotropin or hCG, a hormone produced during pregnancy) are fairly reliable. So most of the time, getting a negative result on a pregnancy test means that you are probably not pregnant.
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Yes, it is possible. Getting a negative result doesn't mean you're not pregnant, it may just mean your hCG levels are not high enough for the test to detect the hormone in your urine.
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False positives are rare. If you take a test and it's negative and then take another test a few days apart and it's positive, it's possible you are pregnant and just didn't have enough hormones in your urine when tested earlier.
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A positive test result is almost certainly correct. However, a negative test result is less reliable. The result may not be reliable if you: don't follow the instructions properly.
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A very rare cause of a false negative is if the hCG hormone in your body doesn't react with the anti-hCG chemicals in the pregnancy test. If this is the problem, you may need to wait a few more days before you can get a positive result. Or, you may need to have a blood test.
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No drug test of this type is 100% accurate. There are several factors that can make the test results negative even though the person is abusing drugs. First, you may have tested for the wrong drugs. Or, you may not have tested the urine when it contained drugs.
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Home drug tests are reasonably accurate, providing you perform them correctly. Unfortunately, there are many factors which could lead to a false positive or negative by reducing the accuracy of the test. A false negative could be caused by an expired test or incorrect storage of the sample.
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A negative result can mean that you are not pregnant, you took the test too early, or you took the test wrong. Pregnancy tests vary in their sensitivity (how soon they can detect the hormone hCG), and you may not have given your body enough time to produce enough hCG hormones that will show up on the test.
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When you allow a test to sit by itself for too long after you've completed it, the urine that is on the test can evaporate. As this urine evaporates the test results can be distorted. In fact, one line can suddenly appear as two, or a negative can look like a positive depending on the test you're taking.
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Urine HCG tests often return false-negative results, particularly very early in pregnancy. This can be stressful and demoralizing to people struggling to become pregnant. Blood tests are typically more accurate, though even these may fail to pick up low levels of HCG in early pregnancy.
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Rarely, certain medical conditions can cause a home pregnancy test to give a false positive. These include: urinary tract infection. kidney disease that causes blood or white blood cells in the urine.
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1 Pregnancy tests can be negative However, in some rare cases, you may be pregnant, but not have enough HCG in your system – which means you won't get a positive reading.