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Most pregnancy tests (home pregnancy tests) determine pregnancy through the detection of the hormone Human Chorionic Gonadotropin (hCG) in a woman’s urine. It is strongly recommended that you wait until you have missed a period to take a home pregnancy test. Normally a blood test or obstetric examination helps to determine a true pregnancy from a false one. During shopping try to choose two different brands – selecting and using two different brands of pregnancy tests will give you a better chance of avoiding the false positive or false negative results.
Discuss your problem with your gynecologist – no matter what the result is (positive false or negative false).
Be sure that test was done in clean conditions – keep everything clean including test elements, urination and body area involved. Evaluate your health conditions and medicine used – clarify and try to understand – the medicines you are taking and whether or not you have any conditions or are on any medications that could possibly give you a false positive reading. Although pregnancy tests are supposed to be 97%-99% accurate that still means that 1 out 100 women testing could have a problem.
Human Chorionic Gonadotropin (hCG) is a hormone which is produced early in pregnancy by the placenta in great volume (hormone released by developing embryos).
If you cannot wait that long to find out and you know the day you may have conceived, then the earliest you can take a test would be 14 days from possible conception. Even a pregnancy test performed on blood can show a false positive under certain circumstances. There are several reasons why your pregnancy test can be positive even if you are not pregnant.
Urine collection should be done carefully to avoid such exposure – don’t use soap or any detergents before making your pregnancy test.
If pregnancy test requested urination in the special cup, the cup should be very clean and presumably free of any leftover soap or any detergents. For accuracy in home pregnancy tests it is essential that you read the test results in the stipulated reaction time. Frequently common reason for a false positive pregnancy test is when women are using hCG injections in order to assist in getting pregnant – it means that hCG levels may register even when a pregnancy does not exist.

While technically not a true pregnancy, some pregnancy tests leave a faint evaporation line as the urine crosses the test. As any product in the market, pregnancy tests also can have different kinds of quality, accuracy and expiration dates.
This kind of tumors can grow in women’s reproductive system and they can provoke false pregnancy positive test.
One reason for a false negative pregnancy test could be that you took the test too early for the Human Chorionic Gonadotropin (hCG) to be present in your blood. A negative result can mean three things – 1) either you are not pregnant, or 2) you took the test too early or 3) you took the test wrongly.
If you are using a collection cup for your test make sure that there are no detergents left on the cup.
Some tests are different and to get the best result it is important to follow the directions properly. Make sure that you follow the directions on the test completely and always check your basal temperature and possible pregnancy symptoms.
Home tests are usually 97%-99% accurate when all instructions are followed correctly and the results are read on time.
If you let the test stay for too long (more than instruction on the box), the test is invalid. If you have had an hCG shot due to infertility treatments, you need to be sure the shot is out of your system before you attempt to use early pregnancy tests.
These include anti-convulsants, medications to treat Parkinson’s disease, certain tranquilizers, and certain diuretics. This faint very light grey evaporation line in the test area is often interpreted as a positive result. Just be careful and check the quality of the product – read instructions, expiration date and accuracy indications. The main reason for false pregnancy test is increased volume of HCG produced by trophoblastic tumors. Pregnancy tests vary in their sensitivity which means how soon they can detect the hormone hCG in your urine.

There is a possibility that while using the home pregnancy test strip you either did not dip it well or did not hold it well in your urine stream, depending on the test you are using.
Also, if you have received different answers on multiple pregnancy tests, it is strongly recommended to get a blood pregnancy test done for more accurate answer. If you have two different readings on two different tests then there is something wrong with one of selected tests. It is also very important – if there is a false positive result because of a medical condition then that is something that you and your doctor can discuss. Normally most variants of the home pregnancy test cannot be considered accurate until taken on the date or a few days after a missed period. Some kits come with two tests so that in case you have made a mistake, you may take the home pregnancy tests again. Due to the high sensitivity of home pregnancy tests, many women catch early pregnancies but end up going on to have their periods due to a chemical pregnancy. These tumors can also provoke false pregnancy symptoms – morning sickness, swelling in the abdomen, strange feelings, etc. It means that you are actually pregnant and the test results are misleading you and your doctor. It is possible that although your ovum might be fertilized, meaning you may be pregnant, but your body has not started secreting enough hCG for the test to measure. Pregnancy test instructions will specify when test results should be interpreted and when test results are no longer valid.
Keep in mind, even with the highest quality control, an occasional defective test may occur. Your body needs at least 14 days after ovulation for the hormone to rise to a high enough level to be detected in a test. If you let the test stay too long (more than indications in the instruction), the test is invalid.

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