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http://www.justmommies.com/articles/hcg-levels.shtml
de: Human Chorionic Gonadotropin (HCG) level

hCG (human chorionic gonadotropin) Levels During Pregnancy
What is hCG (human chorionic gonadotropin)?
Human chorionic gonadotropin, or hCG, is produced during pregnancy. It can be detected by a blood test around eight to eleven days past ovulation. HCG maintains the corpus luteum, which is responsible for progesterone production in early pregnancy. Progesterone helps to keep the lining of the uterus thick for a healthy pregnancy. If there is no hCG present in the womans body the lining of the uterus will begin to shed and a new menstrual cycle will begin.
What are normal hCG levels?
There is quite a range in what is considered a normal hCG level. In about 85 percent of pregnancies hCG levels will double every two to three days. Your doctor may check your beta hCG level more than once to see if it is rising appropriately. See Justmommies hCG doubling calculator.
What are normal hCG levels?
hCG levels during pregnancy
(in weeks since last menstrual period)

3 weeks LMP5 - 50 mIU/ml
4 weeks LMP5 - 426 mIU/ml
5 weeks LMP18 - 7,340 mIU/ml
6 weeks LMP1,080 - 56,500 mIU/ml
7 - 8 weeks LMP7, 650 - 229,000 mIU/ml
9 - 12 weeks LMP25,700 - 288,000 mIU/ml
13 - 16 weeks LMP13,300 - 254,000 mIU/ml
17 - 24 weeks LMP4,060 - 165,400 mIU/ml
25 - 40 weeks LMP3,640 - 117,000 mIU/ml
non pregnant 55-200 ng/ml
Low hCG levels
Low hCG levels may indicate a miscalculated date of conception, an ectopic pregnancy, or a possible miscarriage. However, a perfectly healthy pregnancy may have low hCG levels.
High hCG levels
High hCG levels may indicate a miscalculated date of conception, a molar pregnancy, or a multiple pregnancy.
What can interfere with hCG levels?
Some fertility drugs containing hCG may affect your hCG levels. Other than that, other medications including antibiotics and oral contraceptives will not affect your hCG level. If you are taking a fertility medication that would affect your hCG level your health care provider should discuss with you how this would affect your tests.

http://www.americanpregnancy.org/duringpregnancy/hcglevels.html

Human Chorionic Gonadotropin (hCG)
The Pregnancy Hormone

The hormone human chorionic gonadotropin (better known as hCG) is produced during pregnancy. It is made by cells that form the placenta, which nourishes the egg after it has been fertilized and becomes attached to the uterine wall. Levels can first be detected by a blood test about 11 days after conception and about 12 - 14 days after conception by a urine test. In general the hCG levels will double every 72 hours. The level will reach its peak in the first 8 - 11 weeks of pregnancy and then will decline and level off for the remainder of the pregnancy.
Key things to remember about hCG levels:

In a bout 85% of normal pregnancies, the hCG level will double every 48 - 72 hours. As you get further along in pregnancy and the hCG level gets higher, the time it takes to double can increase to about every 96 hours.
Caution must be used in making too much of hCG numbers. A normal pregnancy may have low hCG levels and result in a perfectly healthy baby. The results from an ultrasound after 5 - 6 weeks gestation are much more accurate than using hCG numbers.
An hCG level of less than 5mIU/ml is considered negative for pregnancy, and anything above 25mIU/ml is considered positive for pregnancy.
The hCG hormone is measured in milli-international units per milliliter (mIU/ml).
A transvaginal ultrasound should be able to show at least a gestational sac once the hCG levels have reached between 1,000 - 2,000mIU/ml. Because levels can differentiate so much and conception dating can be wrong, a diagnosis should not be made by ultrasound findings until the hCG level has reached at least 2,000.
A single hCG reading is not enough information for most diagnoses. When there is a question regarding the health of the pregnancy, multiple testings of hCG done a couple of days apart give a more accurate assessment of the situation.
The hCG levels should not be used to date a pregnancy since these numbers can vary so widely.
There are two common types of hCG tests. A qualitative hCG test detects if hCG is present in the blood. A quantitative hCG test (or beta hCG) measures the amount of hCG actually present in the blood.

Guideline to hCG levels during pregnancy:
hCG levels in weeks from LMP (gestational age)* :

3 weeks LMP: 5 - 50 mIU/ml
4 weeks LMP: 5 - 426 mIU/ml
5 weeks LMP: 18 - 7,340 mIU/ml
6 weeks LMP: 1,080 - 56,500 mIU/ml
7 - 8 weeks LMP: 7, 650 - 229,000 mIU/ml
9 - 12 weeks LMP: 25,700 - 288,000 mIU/ml
13 - 16 weeks LMP: 13,300 - 254,000 mIU/ml
17 - 24 weeks LMP: 4,060 - 165,400 mIU/ml
25 - 40 weeks LMP: 3,640 - 117,000 mIU/ml
Non-pregnant females: <5.0 mIU/ml
Postmenopausal females: <9.5 mIU/ml
* These numbers are just a GUIDELINE-- every womans level of hCG can rise differently. It is not necessarily the level that matters but rather the change in the level.
What can a low hCG level mean?
A low hCG level can mean any number of things and should be rechecked within 48-72 hours to see how the level is changing. A low hCG level could indicate:
Miscalculation of pregnancy dating
Possible miscarriage or blighted ovum
Ectopic pregnancy
What can a high hCG level mean?
A high level of hCG can also mean a number of things and should be rechecked within 48-72 hours to evaluate changes in the level. A high hCG level can indicate:
Miscalculation of pregnancy dating
Molar pregnancy
Multiple pregnancy
Should my hCG level be checked routinely?
It is not common for doctors to routinely check your hCG levels unless you are showing signs of a possible problem. A health care provider may recheck your levels if you are bleeding, experiencing severe cramping, or have a history of miscarriage.
What can I expect of my hCG levels after a pregnancy loss?
Most women can expect their levels to return to a non-pregnant range about 4 - 6 weeks after a pregnancy loss has occurred. This can differentiate by how the loss occurred (spontaneous miscarriage, D & C procedure, abortion, natural delivery) and how high the levels were at the time of the loss. Health care providers usually will continue to test hCG levels after a pregnancy loss to ensure they return back to <5.0
Can anything interfere with my hCG levels?
Nothing should interfere with an hCG level except medications that contain hCG. These medications are often used in fertility treatments, and your health care provider should advise you on how they may affect a test. All other medications such as antibiotics, pain relievers, contraception or other hormone medications should not have any effect on a test that measures hCG.









http://www.babyhopes.com/articles/highhcglevels.html
Do high HCG levels always mean you are pregnant?
Human Chorionic Gonadotropin (hCG) is the "pregnancy hormone" or "announcer of pregnancy" that keeps the corpus luteum producing progesterone when you conceive. It is produced by the placenta during pregnancy and is measured by home pregnancy tests (HPTs). A woman normally produces 25 milli-international units per milliliter (mIU/ml) of Human Chorionic Gonadotropin (hCG) 10 days after conception. As a general rule, Human Chorionic Gonadotropin (hCG) levels should double every two to three days after conception. Accordingly, the concentration of Human Chorionic Gonadotropin (hCG) rises rapidly, frequently exceeding 100 mIU/ml by the first missed menstrual period and peaks in the range of 30,000-200,000 mIU/ml by 8-10 weeks into pregnancy. A Human Chorionic Gonadotropin (hCG) level of less than 5 mIU/ml generally indicates that one is not pregnant.
There is great variation in Human Chorionic Gonadotropin (hCG) levels. It isn't the absolute value that matters in these results, but the change in values. In a normal pregnancy, the level of this hormone approximately doubles about every two days during the first 10 weeks. However, high levels of Human Chorionic Gonadotropin (hCG) may indicate choriocarcinoma of the uterus, ectopic pregnancy, Downs syndrome in fetus, hydatidiform mole of the uterus, normal pregnancy, or ovarian cancer. Once you have had an ectopic pregnancy, you have an increased risk for another, so your HCG numbers may be monitored more carefully.
Normal Human Chorionic Gonadotropin (hCG) levels:
0-1 week: 0-50 IU/L
1-2 weeks: 40 300
3-4: 500 - 6,000
1-2 months: 5,000 - 200,000
2-3 months: 10,000 - 100,000
2nd trimester: 3,000 - 50,000
3rd trimester: 1,000 - 50,000
Non-pregnant females: < 5.0
Postmenopausal: < 9.5
Higher than Average Human Chorionic Gonadotropin (hCG) levels and what they may indicate:
Molar pregnancy
A molar pregnancy is an abnormality of the placenta, caused by a problem when the egg and sperm join together at fertilization. It is marked by high levels of Human Chorionic Gonadotropin (hCG). Molar pregnancies rarely involve a developing embryo, and the growth of this material is rapid compared to normal fetal growth. It has the appearance of a large and random collection of grape-like cell clusters.
Choriocarcinoma of the uterus
This is the malignant variant of molar pregnancy which metastasizes early by the blood route and is treated by chemotherapy. It is marked by high levels of Human Chorionic Gonadotropin (hCG).
Ectopic pregnancy
If your Human Chorionic Gonadotropin (hCG) level increases but is less than double the previous one then it is considered abnormal and suspicious of an ectopic pregnancy. An ectopic pregnany is a condition where the embryo grows outside the uterus.
Twins or Higher Pregnancies
Twin pregnancies also tend to show higher Human Chorionic Gonadotropin (hCG) levels. Twin Human Chorionic Gonadotropin (hCG) levels fall within the reported range of singletons, so, you can't assume anything based on the level alone. A higher level on a given day does increase your chances for twins, but there's no level above which you're guaranteed twins.
Injections
If you have been given an Human Chorionic Gonadotropin (hCG) injection (Profasi, Pregnyl) to trigger ovulation or to lengthen the leutal phase of your cycle, trace amounts can remain in your system as long as 10 days after your last injection. These can give you high Human Chorionic Gonadotropin (hCG) levels. Two consecutive quantitative Human Chorionic Gonadotropin (hCG) beta blood tests can circumvent this problem; if the level increases by the second test, you are likely to be pregnant.










































http://www.allaboutmoms.com/hcg.htm

Human Chorionic Gonadotropin
(hCG) Levels
Human Chorionic Gonadotropin, or hCG, production begins approximately 8-10 days after conception when the embryo starts to burrow itself into the lining of the uterus. It is this hormone that is measured by early pregnancy tests and if present, will return a positive result. An hCG beta blood test is much more sensitive than an HPT, and can detect pregnancy as early as 10 days after fertilization.
As the embryo grows, the level of hCG rises and, as a general rule, hCG beta numbers should double every 36 to 48 hours. A dramatic decrease in the levels may indicate a miscarriage has occurred or is possible, whereas a level that lingers or falls well below the normal range may indicate an ectopic pregnancy. hCG beta levels can also be used to identify a multiple pregnancy. hCG levels will top out by the end of the first trimester.
The numbers in this beta hCG chart are to be used only as a guideline and should be interpreted by your physician.

Weeks from the Last Menstrual Period (LMP)Amount of hCG in mIU/ml
35 - 50
43 - 426
519 - 7,340
61,080 - 56,500
7-87,650 - 229,000
9-1225,700 - 288,000
13-1613,300 - 254,000
17-244,060 - 165,400
25 - 403,640 - 117,000