Different brands may have varying degrees of sensitivity. For example, one brand requires a urine hCG level of 20 or 25 mIU/cc to be positive, but another brand requires 50 mIU/cc to be positive. That might explain why one test results in a positive result while the other results in a negative result. You should try again using a different sample of urine if one sample is not conclusive.
It is unlikely that you will need to repeat a urine test. Most brands can detect a level as low as 5 mIU/cc. But if you are unsure then it is best to follow your doctor's advice. Sometimes women with very high levels of hCG do not show any signs of pregnancy until well into their second trimester. If you are concerned about possible exposure to hCG from a previous pregnancy or a cancer diagnosis, then it is advisable to have regular blood tests throughout your pregnancy.
Because hCG is present in urine and is responsible for giving positive or negative results, it becomes diluted and the test fails. If your urine gets diluted and turns a pale yellow or clear hue, it indicates that your hCG level has decreased. This means that you are not pregnant and need to take another test in about three months.
If you are still trying to conceive and think that you may be pregnant but the test was too easy to read, then you should wait before taking another test. It is normal to get a false negative result once in a while- that is, to test negative even though you are actually pregnant.
A false negative result can happen for several reasons. Sometimes the cause of the problem is obvious - like if you have blood in your urine because of a urinary tract infection (UTI). Other times the reason might not be clear until later. For example, if you drink alcohol regularly and then don't eat meat for a few weeks, your body will start using other sources of protein instead. This can cause a rise in hCG levels but because the urine is diluted, the test won't show this increase.
It is important to remember that a negative result does not mean that you are definitely not pregnant. A lot of things can cause hCG levels to go up even when you are not pregnant. So if you want to be sure, try again later.
If the urine is diluted (due to dehydration) or the test is performed too soon, it might result in a false negative. Second, like with urine or home pregnancy tests, a blood pregnancy test can provide misleading findings (both negative and positive). This is because blood contains many different proteins that may cross-react with the antibody used in the test. Thus, a negative result does not rule out pregnancy. Only two more confirmatory tests can establish with certainty that you are not pregnant: an ultrasound or serum hCG level check.
A negative pregnancy test does not mean that you cannot be pregnant. It may simply mean that the egg has not been released from your ovary yet. You will need to wait until you miss your period before trying again.
In reality, home pregnancy tests have a detection limit for hCG, and if the levels in your urine exceed that limit, you may get a false negative. In other words, if you're pregnant with twins or triplets, you can obtain a negative pregnancy test because your pregnancy hormones are too strong to detect with a regular HPT. Women who use birth control pills or IUDs are at greater risk of having a negative test because they produce more hCG than women who don't have these methods of contraception.
It's important to remember that a negative pregnancy test does not mean that you aren't pregnant. Many factors can cause a negative test even though you are indeed pregnant. The most common reason for a negative test is a low level of hCG in your blood or urine. If this happens early in your pregnancy, there is no need to worry about it being evidence that you are not pregnant. It may be evidence that your baby has not taken up residence yet in the uterus.
A second reason for a negative test is if you have a hormone-producing tumor of the ovary or pituitary gland. These tumors can release large amounts of hCG into the blood which will also cause a negative test. A third reason for a negative test is if you have liver disease or cancer. If you have cancer and it has spread to the liver, antibodies from the cancer cells can cause a negative test result. A fourth reason for a negative test is if you have polycystic ovarian syndrome (PCOS).
As a result, until these disorders are checked out, the presence of hCG in urine should not be utilized to diagnosis pregnancy. Serious urinary tract infections (with high WBC, RBC, and nitrite levels) can occasionally result in a false positive pregnancy test result. These results should be followed up with a confirmatory test.
The presence of human chorionic gonadotropin (hCG) in a urine sample is detected by home pregnancy tests. A false negative reading can be caused by a number of factors, including incorrect use of the test, testing too soon, using an outdated test, or diluting the urine by drinking too much water beforehand. A positive result may indicate a problem with your reproductive system, such as polycystic ovary syndrome (PCOS). A negative result does not guarantee that you are not pregnant. It only means that there was no hCG present in the urine sample taken at the time of the test.
Home pregnancy tests work on the principle of hCG being released from the placenta into the blood stream during pregnancy. The test detects the presence of this hormone in the urine and provides a reading either visually or via a line of beads that changes color when there is a change in pH. These tests require a single morning urine sample. If you are unable to provide a suitable sample, repeat the test later in the day. It is important to remember that a negative result does not guarantee that you are not pregnant. A woman's body produces some hCG even after she has had children, so a second child might still show up as a positive result on a home pregnancy test. Women who have irregular periods or who use hormonal contraception or IUDs/IUSs should wait at least three months after stopping contraception before having their fertility tested with a home pregnancy test.