HCG is a hormone that helps determine pregnancy at the earliest, even when ultrasound is not yet informative. The most accurate method for determining the gestational age is to compose a chart.
At the same time, pay attention to the fact that the term you specified will differ from what your doctor calls you. The fact is that there is an obstetric pregnancy, calculated by a doctor regarding the last menstruation. And the result of the HCG analysis will show the actual gestation period relative to the day of conception, and it reflects the real age of the child.
In addition, it should be remembered that each pregnancy takes place individually. And your indicators may differ from the averages, while being the norm for you. Especially if such differences are insignificant and make up to 24 hours.
If you use the hCG calculator by day, it is most convenient to use the number of days with regard to conception (53%), in second place - the number of days with respect to the delay in menstruation.
How does hCG grow by days?
There is a special table of hCG by day, which presents such indicators as the age of the embryo, depending on the level of hCG.
The value of hCG by day:
- for 1-2 weeks are characterized by an indicator of 25-156 mU / ml;
- at 2-3 weeks the level is already 101-4870 mU / ml;
- 3-4 weeks - 1110-31500 mU / ml;
- 4-5 weeks - 2560-82300 mU / ml;
- 5-6 weeks - 23100-151000 mU / ml;
- 6-7 week - 27300-233000 mU / ml;
- 7-11 weeks - 20900-291000 mU / ml;
- 11-16 week - 6140-103000 mU / ml;
- 16-21 week - 4720-80100 mU / ml;
- 21-39 weeks 2700-78100 IU / ml.
Human chorionic gonadotropin is one of the most important indicators of the presence and development of pregnancy. The indicative growth of hCG by day of pregnancy begins after the embryo is implanted into the uterus. Chorion produces a hormone as early as 6-8 days after the moment of fertilization of the egg.
In the first trimester, hCG ensures support for the yellow body during pregnancy , stimulates the production of hormones such as estrogen and progesterone. And this support is necessary until the system of the fetus-placenta begins to function independently.
In the first weeks of pregnancy, the hCG level doubles every 2 days. And as the period increases, the level of the hormone increases, but the rate of its increase decreases. So, after reaching the level of 1200 mU / ml, hCG doubles every 3-4 days, and after reaching the level of 6000 mU / ml it doubles every 4 days.
Its maximum concentration of hCG reaches at the term of 9-11 weeks, after which the level of this hormone slowly decreases. HCG by day, with double increase in proportion to the number of children.
If the concentration of hCG by day differs from the norm and this is not exactly the result of incorrect timing, this may indicate a threat of abortion or an ectopic pregnancy.
For a more accurate result, the level of hCG by blood should be determined. It is there that beta-hCG circulates, and it is possible to determine pregnancy on it 6-10 days after conception. In addition, the accuracy of determining the hCG by blood is twice as accurate. The indicators of hCG in urine on the days of pregnancy are not so accurate.
HCG is produced by the tissues of the fetus itself, so in the absence of pregnancy there is also no hormone. Measurement of hCG is best performed on day 3 after a delay in menstruation, that is, on the 7-10th day after fertilization. At this time its level and
False positive results
Sometimes it happens that the test shows a certain level of hCG, but pregnancy is not present. This can happen for a number of reasons:
- you have acquired a substandard test;
- you take hCG preparations;
- you have a residual level of hCG from a previous pregnancy;
- you have a malignant tumor - the chorioepithelioma of the uterus.