From http://www.webwomb.com/hpt_levels_hcg_levels.htm

How Pregnancy Is Detected
When a women becomes pregnant her body starts to produce a hormone called HcG (Human Chorionic Gonadotropin) this hormone is what is detected in both urine and blood based tests to give a positive pregnancy result.� This page gives an average range of HcG levels found in � pregnant women at 10 - 22 days past ovulation.� We have also provided at what level the hormone can be detected in some of the more popular HPT's (Home Pregnancy Tests).��

HcG Levels
HcG (Human Chorionic Gonadotropin) is a hormone that is produced by the embryo when its starts to implant itself into the uterine lining (implantation) and begins to grow.� This occurs approximately� 6-10 days after conception.� As it grows, the amount of HcG increases and doubles about every three days.� The purpose of HcG is to keep the estrogen and progesterone levels at their appropriate levels until the placenta has developed enough to take this function over.� HcG levels will reach as high as almost 300,000 mIU/ml (level) and will peak out at� 10 - 12 weeks.�

From http://www.fertilethoughts.net/ft/pregnancy/betachart.html

Beta hCG Levels

This chart represents the ranges of hCG (Human Chorionic Gonadotropin) considered within "normal" range in a Beta hCG test, a blood pregnancy test.

Noticeably there is a very wide scope of "normal" amounts of hCG.� For this reason, Beta hCG tests are most useful when they are done in repetition. Beta hCG levels of a pregnant woman should double every 2 or 3 days for the first few months of pregnancy. Therefore if a repeat hCG test shows a rise in numbers, it indicates a normal healthy pregnancy, whereas any hCG level that fails to increase significantly in 2 or 3 days may indicate trouble in the pregnancy.


The beta numbers in chart should be used only as a guideline and are not the final word on the status of your pregnancy. The results of your blood tests should always be discussed with your physician.

An HCG level of less than 5 mIU/ml generally indicates not pregnant.

Week from Last Menstrual Period (LMP)	Amount of HCG in mIU/ml
3	5 - 50
4	3 - 426
5	19 - 7,340
6	1,080 - 56,500
7 - 8	7,650 - 229,000
9 - 12	25,700 - 288,000
13 - 16	13,300 - 254,000
17 - 24	4,060 - 165,400
25 - 40	3,640 - 117,000