There is no official data related to this but depending upon various online research and the user queries which we receive we can confidently say that it is a very common phenomenon. A woman after trying any of the home-based pregnancy test might wonder as to what is the success rate of such pregnancy tests. There is no definitive answer to this and quoting any figure would be unfair however since ancient times women have been performing pregnancy tests at home. For her to be able to hundred percent confirm about her pregnancy she might need to test couple of times and then along with some of the signals from her body she would be hundred percent sure of the same.
A pregnancy test can be negative even though the woman is pregnant due to various other reasons. They are certain basic rules which needs to be followed for the success of the test.
If everything else is fine than the first and foremost factor to consider is the timing of the test. Timing actually can be the most important factor for the home pregnancy test to be effective and accurate. Most of the women because of testing too early receive a false negative pregnancy test. So it would be feasible and advisable to wait for couple of days before actually taking any kind of urine test. Even the best test that boast of 100% success rate can fail to deliver if you are have been testing very early. It requires some time for your body to develop enough amount of hCG hormone which is detectable by the kit.
Secondly the tests should be performed as the first thing in the morning because the first urine of the day has the most concentrated level of hCG hormone. Testing at any other time of the day or night could result in false negative. As the day progresses every individual is bound to take some liquid diet like coffee, juice, water etc. and that could dilute the urine. For that pregnancy test kit to be able to detect the hCG hormone it is a mandate that the hCG hormone should be present in adequate amount in the urine. So if in case even though you are pregnant but your urine is diluted than that test kit would fail to detect the hCG hormone.
Another reason for the pregnancy test failure is contamination. The test kits should be used with bacteria free hands and it should be placed on a clean surface. Even a small amount of any kind of oil or cream present in your hand can contaminate the test result
So any woman who fails to follow the above rules can get a false negative pregnancy test results. Reputed clinics like Mayo Clinic advise that a woman should wait at least for her to miss her periods to take a home-based pregnancy test. So if in case you want to get pregnant and you test too early you would be actually increasing your frustration and disappointing yourself. It would be good if you can wait for a day or two more.
So if in case you are testing early or testing at the wrong time of the day or are not using clean hands and clean environment then you are bound to receive a false negative pregnancy test.
You can also get a false negative pregnancy test if you are in a hurry. The test kit needs to be allowed at least five minutes for it to settle down and give you the result. So if in haste you will try to have the result very soon it will not deliver the proper and accurate result. And five minutes is theoretical standard you might even need to wait for more than five minutes in some cases. So rather than throwing the test trip after a few second wait for it to complete the test and properly diagnose the sample to determine whether you are pregnant or not.
What are the chances of my test being false negative?
As mentioned above no official statistics are there as to how many women get a false negative pregnancy test results and how many times. No one can calculate the data as not every woman would report the false-negative to their doctors. So if in case you have received a false-negative test and you want to understand that whether it is a common thing for anyone to receive a false negative test or is there something wrong with your body then you can go and see your doctor to get a blood test done. If in case you are on any other kind of medication or have been recently gone through any kind of illness then you will need to give your body some more time to recover and stabilize.
Also if you have been consuming any kind of birth control pills on any kind of fertility drugs lately then you will have high chances of getting a wrong pregnancy test results. The fertility drugs can disturb your hormones and can also mask the hCG hormone so that the pregnancy test kit would fail to detect them inside your urine.
So since the drug would have covered the hCG hormone, the test would be negative but you still might feel nauseated, bloated, fatigued etc. These are all signs of early pregnancy. So if in case these symptoms persist but your test is a negative then you can see your doctor and get a blood test done.
So now you can understand that there could be several factors due to which you can receive false-negative test even though you are pregnant. You might have suffered a recent illness as flu, pneumonia etc. because of which you might be able to conceive but as far as the level of hCG hormones is concerned that will not be appropriate enough for the kit to detect it. In these conditions it is recommended that you schedule an appointment with your gynecologist to get everything clear.