HCG (human chorionic gonadotropin) is a hormone released by the chorion (outer embryonic shell) after attachment of the ovum to the uterine wall. Gonadotropin circulates in the mother's blood and partially excreted in the urine unchanged. This is based on determination of HCG in a biological material. The longer the gestation, the higher the concentration of the hormone. In nonpregnant women the content of gonadotropin in the blood is 0 to 5 mu/ml, in urine – no.
There are methods for the determination of HCG in urine in the home and in blood in a laboratory. To determine pregnancy at home using test strips, tablets, and ink-jet tests, impregnated with a special reagent, upon contact with the gonadotropin causing the emergence of additional second strips. The longer the pregnancy, the brighter will be manifested strip. The reliability of the results of these analyses is 80-90%. Pregnancy is detected at 12-14 days after conception. It is preferable to study in the morning, after the adoption of hygiene procedures, performing the actions specified in the instructions for a particular test.
The most accurate is the laboratory determination of the quantity of HCG in the blood. The reliability of the results of this study is in the range of 99-100%. Using specialized laboratory equipment that produces a quantitative assessment of the level of gonadotropin in the blood, giving specific figures. This method allows to detect pregnancy 10-14 days after conception. To obtain the correct results it is necessary to prepare for the study. On the eve of blood donation should follow a diet that excludes from eating fatty, fried foods, alcoholic beverages. On the day of the procedure it is not recommended to eat, to drink beverages. It is permissible to drink a glass of water. The blood gives up fasting in the morning in the treatment room women's clinic or any other medical institution.
You must know that there are false positive and false negative results of determining the amount of HCG in biological material both in the home and in the laboratory. Given that the beta hCG levels begin to rise after the egg attaches to the uterine wall, i.e. 6-10 days after conception, should study the hormone on 2-3 day delay. Otherwise, when conducting the test it is possible to obtain a negative result with the current pregnancy. Positive results for HCG in the absence of conception, may be the result of recent abortion, drug hormones. If you suspect a pregnancy, you should consult a gynecologist who will prescribe the direction to determine the level of HCG in the blood, and, if necessary, appoint additional examination for a more accurate establishment of gestational age.