What is the 'Arithmetic Mean' The arithmetic mean is a mathematical representation of the typical value of a series of numbers, computed as the sum of all the numbers in the series divided by the count of all numbers in the series. The arithmetic mean is sometimes referred to as the average or simply as the mean. Some mathematicians and scientists prefer to use the term arithmetic mean to distinguish it from other measures of averaging, such as the geometric mean and the harmonic mean.
HCG can be detected in urine or blood after implantation, which occurs on average 9 daye (range 6-12 days) after fertilization. Some home pregnancy tests claim to detect hCG as early as 4 days before the next expected period.
High sensitivity tests are able to detect early pregnancy, when the HCG concentration in urine reaches 20-25 mIU/ml. There are also extra-sensitive 10mIU tests, but most women still prefer the first ones. They are reported to be more stable. Implantation usually occurs on the 7-10th day after ovulation. Still, you should take into account that the level of the HCG-hormone doesnât reach the expected mark right away.