Pregnancy tests are used to find out if you are pregnant or not. Usually a pregnancy test works by placing it in the urine stream and then the tests can detect whether there is HCG in your organism. HCG is a hormone, which is produced during early pregnancy.
There are some pregnancy tests that help to determine the presence of HCG at the very beginning of your pregnancy. You should know that home pregnancy tests can be both very accurate and not accurate.
Pregnancy tests can be false because of several possible reasons. It should be remembered that if you have a positive pregnancy test, then you need to visit a doctor.
The reasons of false pregnancy tests results can be the following:
1. Ectopic pregnancy
An ectopic pregnancy occurs if the fertilized egg gets stuck in the fallopian tube during its coming to the uterus. The reasons of an ectopic pregnancy can be: deformed fallopian tube, a scar tissue or inflammation in the fallopian tube; the presence of uterine infections in the past.
2. Chemical pregnancy
A false positive pregnancy test result is possible if you are not technically pregnant. This can be caused by a chemical pregnancy, which occurs if the fertilized egg is unable to implant or grow very early.
3. User error
Pregnancy tests done at home are not 100% reliable. It is necessary to follow the instructions for use and check the expiration date before using the test. Even if the test and its expiration date are all in order, an error may occur, for example, if it is too early to take the test during your menstrual cycle. In this case, a false negative or false positive result may occur.
It is recommended to use the test when your urine is concentrated, when you first wake up in the morning.
4. Recent miscarriage or abortion
It is possible that you may continue having a positive pregnancy test result after losing a pregnancy or after a miscarriage.
Some medications you take may cause your test to be false. These may be the following brands: Pregnyl, Profasi, Novarel and Ovidrel. There are other medications that can cause false positive pregnancy tests. They include: anticonvulsants, such as phenobarbital or other barbiturates; anti-anxiety drugs such as diazepam or alprazolam; methadone; diuretics such as furosemide; Parkinson's drugs; antihistamines, including promethazine; antipsychotics, such as clozapine or chlorpromazine.
6. Evaporating lines
There are cases when the evaporation line can be mistaken for a positive pregnancy test result. Typically, pregnancy tests, which are done at home, show two lines, when HCG is detected, and one line, when HCG is not detected. The lines should be of a bright color (red, pink or blue). Sometimes the second line may be light, which may indicate an early pregnancy, but sometimes it may also be an evaporation line. If the line is completely colorless, then it is most likely the line of evaporation. It also may appear on the test after your urine has completely evaporated. Such lines can be caused by hormonal levels, but this does not mean that you are pregnant.
7. Some medical conditions
Some specific medical conditions can lead to a false home pregnancy test result. These conditions include: problems with the pituitary gland (very rarely); ovarian cysts; urinary tract infections; kidney diseases that cause blood or leukocytes in the urine; more serious diseases such as ovarian cancer.
So, if you do a pregnancy test, you should not fully rely on the test result.