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From other websitesContent disclaimerContent on this website is provided for information purposes only. Information about a therapy, service, product or treatment does not in any way endorse or support such therapy, service, product or treatment and is not intended to replace advice from your doctor or other registered health professional. The information and materials contained on this website are not intended to constitute a comprehensive guide concerning all aspects of the therapy, product or treatment described on the website. All users are urged to always seek advice from a registered health care professional for diagnosis and answers to their medical questions and to ascertain whether the particular therapy, service, product or treatment described on the website is suitable in their circumstances. The State of Victoria and the Department of Health shall not bear any liability for reliance by any user on the materials contained on this website. When it’s time to take a pregnancy test, your emotions may be running high. Some women strongly suspect that they’re pregnant but then get a negative test result. If you’re sure you’re pregnant, but your test was negative, then read on. We’ve outlined the different ways your test could have gotten messed up. Before the 1970s, there was no way women could tell if they were pregnant without the help of a doctor. At-home pregnancy tests weren’t invented until 1976. The technology used in these tests has improved significantly since then. When used correctly, they are almost 99 percent accurate. If you’re attempting to
use an at-home pregnancy test, read the directions carefully and follow them closely. Any skipped steps or timing issues can give you the wrong results. Take a quiz Find out what you can do with our Health Assistant The test strip is designed to track the levels of human chorionic gonadotropin (hCG) in your urine. HCG is a hormone that’s created in your body once a fertilized egg implants in the uterus (or outside the uterus in case of an ectopic pregnancy). Your body only produces this hormone if you’re pregnant (the production of the hormone by some cancerous tumors is the only exception). HCG doubles roughly every 48 hours, but this isn't the case for everyone — you can use our online hCG calculator to track your hCG levels at home. To get the most accurate results, follow these steps:
Each test has different “positive” and “negative” indicators, so read your package carefully to make sure you know what the various results mean. Some common results for “pregnant” are:
Some women get a negative result only to find out later from their doctor that they are, in fact, pregnant. There are a few reasons why the test may not read your hCG correctly. What causes a false-negative pregnancy test?If you got a negative reading from a pregnancy test but later learned that you were pregnant, how did the test get it wrong? What causes false-negative pregnancy tests? There are a few ways that the test could read your urine wrong. Incorrect use of the pregnancy testIf you don’t follow the directions on the package, the pregnancy test will not be set up properly to test your urine. Each test is different and comes with different directions. You may have missed a step or performed the test incorrectly. If you’re getting a false-negative pregnancy result consistently and you’re sure that you’re pregnant, go to the doctor. They use a similar pregnancy test, but they’re used to the variables and can have more accurate results. Used the pregnancy test too earlyYour hCG won’t be high enough to detect until six days after conception. If you took the test too early, then the test will read negative even if you are pregnant. The test is fine-tuned to detect low amounts of hCG, but there aren’t enough hormones to be detected on the test until about a week after conception. It’s a good idea to wait until the first day of your missed period to take a pregnancy test. Once your hCG levels are high enough, your period should stop. That means it’s been at least six days since conception, and the test should read positive if you’re pregnant. Miscalculated menstrual cycleYou have to be sure about the timing of the first day of your period. Many women have irregular periods, or don’t track them, and may get the day wrong. When you track your periods, you can get to know your cycle. It has its own ebbs and flows, but you can learn the basics, like the typical length of your cycle. If you know your cycle, you can tell with more accuracy when you missed the first day. On average, a normal cycle is between 21 and 35 days. Some women take a pregnancy test just before their period is supposed to start, when hCG levels are too low to be detected. Diluted hCG levelsDiluting your hCG levels can also give you a false-negative pregnancy result. If you’re preparing to take a pregnancy test, it’s best to take it first thing in the morning. Some women drink water or other fluids early in the morning or late at night in order to be able to pee in the morning for the test. Diluting the urine can spread out the presence of hCG and make it too low for the test to read, giving you a false reading. Too much hCG in the urineConversely, if your hCG levels are too high, your pregnancy test can also return a false-negative. This is called a “hook effect.” It’s very rare, but it does happen. Pregnancy tests are designed to track a specific range of hCG in the body. If you have too little, (if you took the test too early or diluted your urine), it won’t be detected. If you have too much, (if you took the test too late), the test strip may not be able to bond to any of the molecules, possibly showing a negative result. What to do if you have a late period and negative pregnancy testsIf you’ve gotten a negative pregnancy test but haven’t had your period, is something else causing your period to be late? There are a handful of reasons (other than pregnancy) why you might miss a period, such as:
If these explanations don’t apply to you, visit the doctor to get a second pregnancy test. They use a blood test, which is more accurate and can detect lower levels of hCG than a home pregnancy test can. Bottom lineWhen it comes to pregnancy tests, follow the directions and know your cycle. If you’ve followed the directions closely and know your cycle well, you should get accurate results. However, if you suspect you’re pregnant and are still getting false-negative pregnancy test results, then go to your doctor. They can determine for certain whether you’re pregnant or if you’ve missed your period for some other reason. Updated on October 3, 2022 https://www.fda.gov/medical-devices/home-use-tests/pregnancy https://medlineplus.gov/ency/article/003619.htm https://www.mayoclinic.org/healthy-lifestyle/getting-pregnant/in-depth/home-pregnancy-tests/art-20047940 How accurate is a hospital pee pregnancy test?A urine pregnancy test at the doctor's is basically the same as the type you would buy at the store and take at home. These show results much faster than a pregnancy blood test, usually within a few minutes. Both types of pregnancy tests at a doctor's office are 99% accurate.
Are hospital pregnancy tests ever wrong?As with home urine tests, it is possible (although rare) to end up with false results (both negative and positive) from a blood pregnancy test.
Can a clinic urine pregnancy test be wrong?A false-positive test result only happens less than 1% of the time, but when it does, it can make the following days or weeks confusing before you realize you're not actually pregnant.
Are hospital urine pregnancy tests sensitive?Qualitative urine pregnancy testing (UPT) is widely used in the emergency department and is thought to be a reliable test with reported sensitivities and negative predictive values as high as ∼100%.
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