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Q: How long can a pregnancy test produce false results?
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Are there other more serious causes of a false negative pregnancy test?

There are several things that can contribute to a negative pregnancy test even if you are pregnant. Some medications can give you a false negative, the timing of the test can affect the results. If you did not follow directions properly; if you let the test sit for too long the results may read negative after a while. It is important to read the results within the amount of time given on the instructions of that particular pregnancy test you bought


How long does false pregnancy last in dogs?

9 weeks on average.


How long does it take for the results to show on a pregnancy test?

2 minutes


How long does a blood pregnancy test take?

You can usually get results the next day


Can you get false positive pregnancy test but be pregnant?

On rare occasions you can encounter a false positive due to improper testing, expired pregnancy tests, rare medical conditions such as certain types of cancer, evaporation lines, a recent pregnancy or a chemical pregnancy. There are several things that can contribute to a negative pregnancy test even if you are pregnant. Some medications can give you a false negative, the timing of the test can affect the results. If you did not follow directions properly; if you let the test sit for too long the results may read negative after a while. It is important to read the results within the amount of time given on the instructions of that particular pregnancy test you bought. If you did not perform the test properly (example: you drank a lot of fluids before taking the test, which can dilute your urine). Etc To ensure the best results: * Take the test in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highest * Don't drink a bunch of fluids before taking the test because it will dilute your urine and can affect the results * Take the test no more than 1 day before expected period. Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low. * urinate for as long as possible on the foam-like strip * Check the results in the window frame of time suggested by the instructions of the pregnancy test.


Could hyperthyroidism cause a false negative on a pregnancy test?

No. There is almost nothing that can cause a false positive pregnancy test, and all of the causes require an urgent visit to a health care provider._______________________________________________________________Malfunctioning thyroids can't; they don't produce the correct hormones to trigger a pregnancy test. But to swear nothing can cause a false positive is irresponsible and false in it's own right. I've been the victim of a false positive test. Always be sure to test in the morning when urine is more concentrated. It's also best to avoid drinking a ton of water before testing, or after to try and test again. This can mess with the test and give false results.1. False positive pregnancy test due to improper testing...Improper testing can lead to false positive results. Always follow the directions! Instructions will specify when test results are no longer valid. You should time and record the time you perform the test, and read results at the instructed time. Guessing can lead to false results. "Double checking" your results often leads to false positives. Fishing your test out of the garbage after too much time has passed can change the initial results.2. Evaporation line on a pregnancy test...With some tests you can see where the testing line is. When urine runs across the test strip it can briefly change the color. Some tests allow you to see what can best be described as a watermark; kind of like what you see on US paper currency. If there is no color or you have to really mess with it in the light to see a line; it could be an evaporation line. Try retesting in a few days or using a digital test is recommended.3. False positive pregnancy tests can be caused by certain medications...Sometimes urine can be contaminated with blood or large amounts of protein, which can lead to false positive results.4. Certain medical conditions can lead to false positive test results...If you receive a positive result from a home pregnancy test it is important to see your doctor. It's is not common, rare medical conditions can cause false positive results on home pregnancy tests. Certain cancers, can cause higher levels of hCG levels.5. Defective pregnancy tests...Expired or faulty tests can also lead to false positive results. Remember, an occasional defective test may come out of a batch.If you're unsure about the results of your home pregnancy test, ALWAYS consult your doctor.


How long does it take to get results from a blood pregnancy test?

A few hours or upto a week


Why would a home pregnancy show negative and 2 days later show positive?

You could have taken the test too soon or you could have take the test improperly. You are more likely to encounter a false negative rather than a false positive though. There are several things that can contribute to a negative pregnancy test even if you are pregnant. Some medications can give you a false negative, the timing of the test can affect the results. If you did not follow directions properly; if you let the test sit for too long the results may read negative after a while. It is important to read the results within the amount of time given on the instructions of that particular pregnancy test you bought. If you did not perform the test properly (example: you drank a lot of fluids before taking the test, which can dilute your urine). Etc To ensure the best results for a home pregnancy test: · Take the test in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highest · Don't drink a bunch of fluids before taking the test because it will dilute your urine and can affect the results · Take the test no more than 1 day before expected period. OR 14 days after intercourse (sex). Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low. · urinate for as long as possible on the foam-like strip · Check the results in the window frame of time suggested by the instructions of the pregnancy test. . On rare occasions you can encounter a false positive due to improper testing, expired pregnancy tests, rare medical conditions such as certain types of cancer, evaporation lines, a recent pregnancy or a chemical pregnancy.


How long can you keep urine for pregnancy test?

yes you can store urine I did it for four hours and then used a pregnancy test and my results were positive and accurate


What can happen if you pee on a pregnancy test too long?

it could tamper with the results but i wouldn't worry about it


Can pregnancy test show false negative?

Certainly! There are several things that can contribute to a negative pregnancy test even if you are pregnant. Some medications can give you a false negative, the timing of the test can affect the results. If you did not follow directions properly; if you let the test sit for too long the results may read negative after a while. It is important to read the results within the amount of time given on the instructions of that particular pregnancy test you bought. If you did not perform the test properly (example: you drank a lot of fluids before taking the test, which can dilute your urine). Etc To ensure the best results: * Take the test in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highest * Don't drink a bunch of fluids before taking the test because it will dilute your urine and can affect the results * Take the test no more than 1 day before expected period. Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low. * urinate for as long as possible on the foam-like strip * Check the results in the window frame of time suggested by the instructions of the pregnancy test.


Can pregnecy tests somehow give the wrong answer?

Yes; There are several things that can contribute to a negative pregnancy test even if you are pregnant. Some medications can give you a false negative, the timing of the test can affect the results. If you did not follow directions properly; if you let the test sit for too long the results may read negative after a while. It is important to read the results within the amount of time given on the instructions of that particular pregnancy test you bought. If you did not perform the test properly (example: you drank a lot of fluids before taking the test, which can dilute your urine). Etc On rare occasions you can encounter a false positive due to improper testing, expired pregnancy tests, rare medical conditions such as certain types of cancer, evaporation lines, a recent pregnancy or a chemical pregnancy.