Updated on 19 October, 2021
Most sensitive pregnancy tests come with an auto-pilot function so that they can simply and quickly be tested. They are designed to check hormones and other substances in the body. The sensitivity of the test makes it necessary for the tester to be sitting directly underneath a bright light. Most common home tests can be done using a urine test, a saliva test or a blood test. These home tests can tell you if you are indeed pregnant.
Most sensitive pregnancy tests rely on the hormone HCG to tell if you're pregnant. This hormone is a bit of a wild card. It can have many levels of accuracy depending on the levels of HCG that are present in your system at different times during your cycle. A false positive result means that the test indicates you're pregnant, while you're NOT. A true negative result means that you're not pregnant; the level of HCG in your system is too low to indicate pregnancy. Most commonly, a true negative result will give rise to a series of follow-up tests.
Most often a positive pregnancy test result is an indicator of implantation. Implantation occurs when a egg is fertilized by a sperm. Once a baby is delivered, the baby is still covered with an embryo. The embryo takes about a week to implant itself into the uterus. If the embryo did not implant, then the pregnancy was unsuccessful, regardless of the hcg level.
Most home pregnancy tests rely on the method of how the hcg levels are detected in urine. Most frequently, midstream tests are performed. These midstream tests look for levels of HCG in the urine. Some urine tests do not detect HCG levels.
The most sensitive urine tests rely on the detection of HCG in a woman's blood. When a woman is tested for pregnancy, her blood is mixed with a compound that can only be detected by the existence of HCG in the urine. Most often this compound is HCG. The compound is not soluble in water and it must be processed before it can be detected in urine. Most diagnostic kits used for the detection of pregnancy rely on this method. However, many other urine-based tests exist and may be better options for some women.
There are other home pregnancy tests that may be more appropriate for some women than are the strips or urine tests found on the market today. For example, one testing kit actually tests for HCG using an infrared probe that looks like a camera. The probe is carried into the urethra and a computer readout is given based on the level of HCG in the urine. This is the most sensitive of the modern fertility pregnancy tests and is recommended for use in early pregnancy.
Other home pregnancy tests depend less on the quality of the compound being tested and more on the ability of the hcg test to detect certain characteristics of a possible pregnancy. Most of these home pregnancy tests use a method called "hatching". The hatching process works when the compound is introduced into the urine just prior to the woman beginning to feel the effects of pregnancy. If the compound is found at this time, it will be considered a positive result for pregnancy. However, if it is not found during this process, it will not be considered a positive result and will not be considered a viable reason for pregnancy.
One modern fertility pregnancy test that is often used is the "million spermatozoa" test. This test looks for the presence of millions of single-celled organisms in the urine. This is the same type of microorganism that can be found in the urinary tract. The million spermatozoa are detected when they swim forward through the urinary tract and join up with other single-celled organisms in the urethra. Because these organisms cannot be seen by the naked eye, this type of home test is less sensitive than the home tests that detect single-celled organisms.