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.
If you use a home pregnancy test after an hCG injection, it is advisable to wait 20 days before interpreting the test as positive or negative. The best way to detect a pregnancy after an hCG injection or shot is the hCG beta blood test. The blood test is much more sensitive than an urine pregnancy test. The blood hCG test can detect a pregnancy as early as 10 days after fertilization with one caveat. You need two tests several days apart. If you are not pregnant, then the blood hCG numbers will be zero or they will decrease. If you are pregnant then they will rise.