- Why pregnancy tests can show the wrong result
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- How accurate are dating pregnancy tests
- Pregnancy Tests
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Why pregnancy tests can show the wrong result
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It for my test with over. You've not only test is one that is done, june 11, also tells you. Jump to establish the first and bought 5 clear blue tests are the uterus. This is very rare, but sometimes if a woman takes a test at the end of her first trimester or later, the test might not detect hCG, as her levels may be higher than the test is designed to pick up.
How accurate are dating pregnancy tests
This is called "the hook effect" and could explain why some women believe they're not pregnant until they give birth, even if they do take a test. A positive test doesn't always mean a pregnancy is viable. A miscarriage can occur so soon after implantation that it may not even delay your period, and you might not have noticed you were pregnant except for your positive test result.
This is called a chemical pregnancy and it's very common. Sometimes an 'evaporation line' can appear on a test as urine dries in the test window, and some women may confuse it for a very faint second line. It's most likely to show up when a test is viewed after the recommended reading time has passed, and it can be a different colour to the line that will appear with a positive result. You should take another test if this happens.
- Why pregnancy tests can show the wrong result!
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Some medications contain hCG that can be picked up on a pregnancy test, even when you're not pregnant. These include hCG injections for fertility treatment, medications for convulsions and Parkinson's disease, some tranquilisers and diuretics, and even certain types of antihistamines.
If you're taking any of these you might be warned to wait until the medications are out of your system before taking a test. Certain medical conditions can affect pregnancy test results, whether or not you're been diagnosed before falling pregnant. For example, if you have a UTI or kidney problems, blood or protein might be in your urine, which can change the test result.
Ovarian cysts, menopause and antibodies can also affect hormone levels. It could also be an issue that develops between ovulation and implantation, such as an ectopic pregnancy or a molar pregnancy. An ectopic pregnancy is when an egg implants somewhere besides your uterus, usually in the Fallopian tubes, and a molar pregnancy is when a fertilised egg grows into a tumour instead of a baby, somewhere in the tubes or uterus.
With an ectopic pregnancy, hCG will be produced but it will be unusually low because the egg won't be growing as it normally would.
With a molar pregnancy, hCG levels may be unusually high because the tissue grows more quickly than in a normal pregnancy. This is why it's important to see your GP for a follow up blood test after getting a positive result on a home test: If you recently miscarried or had an abortion there might still be hCG in your body from the previous pregnancy. Women who are hoping to fall pregnant again soon after a miscarriage may be disappointed to realise that a positive test doesn't necessarily mean they are pregnant again, as it can take a while for hormones to return to their pre-pregnancy levels.
If you collect your urine in a cup you've used for a test before - if the cup still has traces of old urine, soap or water - the results can be affected. Use a new cup or buy a pee stick test instead. Always check the use-by date on a test. An expired test could give an inaccurate result if the dyes that are used for the test and control lines have faded, or if the chemicals are no longer strong enough to detect hCG.
A test can also be faulty if it has been stored in a hot or moist area such as the bathroom , in an open box. Conception View all Forums.