You may get a false positive result if you have recently been pregnant (even if you did not carry to full term). These tumors develop in the reproductive tract and produce hCG. Instead of growing into a baby, the egg grows abnormally and becomes a tumor. Trophoblastic tumors form when something goes wrong with the fertilization of an egg by the sperm. A trophoblastic tumor is one example of a rare medical condition (only 3,000 cases occur in the United States each year) that can cause a false positive result. Ectopic pregnancy, ovarian cysts, menopause, and other rare medical conditions can produce misleading results. When this happens, it’s possible that the test will yield false positive results. Kidney disease and bladder infections, for instance, can cause hematuria. It’s also important to know that these cups are generally sterile and don’t need to be washed before using.Īnother potential contaminant is blood, which may be present in urine for reasons other than your menstrual cycle. If you do wash the cup, it’s crucial that you remove all soap or detergent before testing. Washing the cup may inadvertently contaminate the urine sample if you do not wash out all the soap. Another reason for a false positive test result is the presence of impurities in the urine sample, such as soap, detergent, or blood. Medications that can affect hCG levels are:Ĭontaminated urine sample. Other fertility therapies (such as clomiphene citrate and progesterone) and hormonal contraceptives should not affect the results. These include drugs used as part of fertility therapies, specifically drugs containing hCG. Certain prescription medications can alter hCG test results.This can save you and your partner from the potential heartbreak of finding out that you are not expecting as you had hoped. While early-detection pregnancy tests can show a positive result just days after ovulation, it is advisable to wait until after your first missed period to test. Testing too early is common among women who are trying to conceive and are anxious to know whether they have. You may experience a chemical pregnancy without ever realizing it if the miscarriage occurs soon after conception and your menstrual period arrives on time. According to fertility experts, up to 70 percent of conceptions end in miscarriage. Always check the expiration date of the test before use. If you read the results after the recommended time has elapsed, you may confuse the appearance of urine evaporation lines with a faintly positive test line.Įxpired pregnancy test. ![]() It is not at all unusual for evaporation lines to appear on the test strip as your urine dries. You must read pregnancy test results within the time frame specified on the test. Every test measures different levels of hCG.Įvaporation lines. It is important to read the manufacturer’s instructions carefully before taking a pregnancy test. One of the most common reasons at-home urine tests return false positives is that they were not done properly, usually because the instructions were misunderstood. There are many different reasons why a pregnancy test may yield false positive results. If an at-home pregnancy test shows a positive result, it is important to have a healthcare professional confirm the result with a blood test after that, it is important that you continue to see your healthcare practitioner on a regular basis so that he or she can help you maximize your chances of maintaining a healthy pregnancy.Ĭauses of a False Positive Pregnancy Test A positive hCG test result does not necessarily indicate a viable pregnancy. Of course, it is possible for a woman to become pregnant, get a positive test result, and then miscarry.
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