are some pregnancy tests more sensitive than others?
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Some pregnancy tests may be more sensitive to hCG than others. Certain brands might claim that their test can give you an accurate result as early as five to six days before your missed period. Some tests may also work a little faster — giving you results within a few seconds instead of a few minutes.
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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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Blood test results are about 99 per cent accurate and can detect lower amounts of hCG than urine pregnancy tests. The two main types of blood pregnancy test include: Quantitative blood test – measures the exact amount of hCG in the blood and can give you an estimate of how far along the pregnancy has progressed.
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Pregnancy tests work to find human chorionic gonadotropin (hCG) in your urine. ... Dye tests tend to be more sensitive to hCG, making them better options for earlier use. While pink dye tests win for internet popularity, they boast a similar sensitivity to blue dye options.
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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.
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The early pregnancy test kits are easy to use and extremely reliable and offer excellent value for money. The sensitive early pregnancy test, 10 miu/ml, may be performed 7-10 days after conception. One Step early pregnancy tests are over 99% accurate in laboratory testing.
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According to United States's Office on Women's Health, home pregnancy tests can be 99 percent accurate when used correctly. The amount of hCG present in a woman's urine increases with time, and an accurate result is usually obtained if the test is taken after a missed period.
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Tests may not detect pregnancy until HCG has risen to a certain level.
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High levels of hCG can overwhelm the antibodies that pregnancy tests use. When too much hCG is present in a sample, the antibodies may fail to bind, and the test will appear negative.
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One kit, the First Response Early Result Pregnancy Test, emerged as the most reliable and sensitive test. "It detected hCG at concentrations as low as 6.5 mIU/ml (thousandths of an International Unit per milliliter) - that's almost sensitive enough to detect any pregnancy soon after implantation," CR wrote.
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Sensitive tests detecting hCG in urine will indicate pregnancy on the first day of a missed period, while the majority of home tests detect it on the 5th–10th day from your expected period.
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If you just can't wait, the First Response Early Result test is what you want to grab. It's the most sensitive over-the-counter pregnancy test, and can accurately tell you if you're pregnant up to five days before your period is due.
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Although pregnancy tests often are performed before initiating contraception, the accuracy of qualitative urine pregnancy tests varies depending on the timing of the test relative to missed menses, recent sexual intercourse, or recent pregnancy.
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Pregnancy Testing Before a Missed Period As pregnancy tests become more sensitive and able to detect even minute amounts of hCG, early results like these may not only become more commonplace but offer greater accuracy in delivering a positive result.
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According to Cole's research (PDF), Clearblue Easy and EPT are both less sensitive than First Response but more sensitive than other tests. These tests also detect hCG-h but not as well as First Response.
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You might get a false-negative pregnancy test for other reasons. Some at-home pregnancy tests aren't as sensitive to hCG as others. Or you may take a test too early. It takes time for the hCG hormone to appear in your urine.
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Negative test results Pregnancy tests vary in their sensitivity (how soon they can detect HCG and what level of HCG needs to be present). You can find information on the packaging about how sensitive your test is. If you still think you're pregnant after a negative result, wait a few days and try again.