The ovulation test measures the concentration of the ovulating hormone LH (luteinizing hormone).
24-36 hours before ovulation, the LH hormone rises significantly, and if you use an ovulation test, it will become positive when the hormone has increased due to ovulation.
You can identify a positive ovulation test by the test line being as dark or even darker than the control line.
See an example of a positive Gravidtid Ovulation Test Strip in the product images.
It is recommended to start testing for ovulation 2-3 days before the expected ovulation. Ovulation typically occurs 14 days before the start of your menstrual period. So, if your cycle is 28 days, you should start testing for ovulation on day 11 or 12 (day 1 being the first day of your last menstrual period).
If you're unsure about the length of your cycle, it is recommended to start testing on day 10 or 11 of your cycle.
Pregnancy tests are designed to detect the pregnancy hormone Human Chorionic Gonadotropin, also known as hCG. This hormone increases if a fertilized egg implants in the woman's uterus. Therefore, an elevated level of hCG in the woman's urine indicates pregnancy.
Pregnancy tests have two antibody lines. One is the control line, which becomes colored when dipped in urine. If the control line appears with color, you know that your test is functioning correctly. The other line is called the test line, and this line only becomes colored if your urine contains the amount of pregnancy hormone hCG that your pregnancy test is sensitive to.
hCG starts to rise when the fertilized egg has implanted itself 5-10 days after fertilization by a sperm cell and has started to divide. The level of the pregnancy hormone hCG then increases rapidly and doubles every three days in the first 12 weeks of pregnancy.
Clinical tests have shown that 99% of all pregnant women can test positive on a standard pregnancy test on the day of their expected menstrual period.
The reliability of early and standard pregnancy tests today is so high that it is extremely rare for them to give a false positive result. If your test is positive, meaning if a colored line appears on the test line of the pregnancy test within the designated time frame, then you are pregnant.
However, some individuals may still experience menstruation on or a few days after their expected menstrual period, leading them to believe that the pregnancy test was a false positive. In most cases, this is due to a biochemical pregnancy loss, also known as an early miscarriage occurring between weeks 3-5. During this period, a pregnancy can only be detected by a pregnancy test or a blood test, but a fetal heartbeat would not be visible on an ultrasound. Nevertheless, if a colored line appears within the specified time frame mentioned in the instructions, it indicates that an elevated hCG level has been detected, which means you are or were pregnant.
Please note that there are medications, such as Ovitrelle, that can cause an increase in hCG levels without being pregnant.