The abbreviation HCG stands for "human chorionic gonadotropin," it is also HG (chorionic gonadotropin). This is a special pregnancy hormone.
Diagnosis of pregnancy and using home tests, which are based on the analysis of HG, excreted in urine. However, the reliability of HCG obtained at home is much lower than the laboratory blood test, because the required level of hCG in the urine occurs much later than in the blood.
HCG Is a hormone that produces the cells of the embryo shell. If b-hCG is found in the blood, therefore, chorial (embryonic) tissue is present in the body, then the woman is pregnant. Perhaps very early detection of pregnancy using a blood test for hCG. Already a week after fertilization, a blood test for hCG will have a positive result.
About what the analysis of a blood on hCG speaks.
The role of chorionic gonadotropin during the first trimester of pregnancy is to stimulate the emergence of hormones of progesterone and estrogen, necessary for the development and maintenance of pregnancy. In the future, these hormones provide the placenta (in the normal course of pregnancy).
HCG is very important, because in the male fetus, hCG stimulates specific cells that synthesize testosterone. Testosterone contributes to the formation of male genital organs and affects the adrenal adrenal cortex and, therefore, is absolutely necessary.
Why you need to donate blood to HCG
A blood test for hCG, AFP, RAPP-A is also performed to determine the risk level for the birth of a child with Down's syndrome. These tests are performed between 10 and 14 or 16 and 20 weeks of pregnancy, with the calculation of the period to be made from the first day of the last menstruation. In other terms, the results of blood on HCG are poorly interpreted and its informativeness is questionable.
Analysis for hCG it is desirable to carry out with the help of a special computer program that allows obtaining information of a high degree of reliability of the value of biochemical markers, and this, in turn, gives a chance of a very accurate calculation of the probability of a child with Down syndrome.
But, if deviations in the levels of biochemical markers are noticed, this does not mean that the fetus is sick. In this case, further examinations and pre-natal studies of fetal chromosomes are required, and blood must be additionally given to HCG for a more detailed study.
When a blood test for hCG is prescribed.
The most common factors when a blood test for hCG for women is prescribed is amenorrhea, early pregnancy diagnosis, the determination of the possibility of an ectopic pregnancy, the evaluation of the completeness of induced abortion, the dynamic tracking of pregnancy, the threat of miscarriage and an undeveloped pregnancy, for the diagnosis of tumors, for prenatal diagnosis of malformations the fetus.
In men, this analysis is used to diagnose testicular tumors.
Results of blood on hCG and its norm in blood
In the norm of hCG, for men and non-pregnant women < 5 мЕд/мл
In norm, for pregnant women the result of blood on HCG gradually increases. In the first trimester of pregnancy, the b-hCG level doubles every two to three days.
At 10-12 weeks of gestation, the maximum hCG level in the blood is reached by 10-12 weeks, after the content of hCG slowly falls and stops at a constant value during the second half of pregnancy.
The increase in b-hCG during pregnancy occurs in multiple pregnancies, toxicosis, diabetes, fetal pathologies and Down's syndrome, and the use of synthetic gestagens.