Human chorionic gonadotropin - a hormone of pregnancy. This material determines the normal course of gestation period. According to the level of human chorionic gonadotropin can be found, whether in the end came with a high probability of pregnancy. However, in some cases, it may be wrong HCG.
When possible errors in the analysis results
The accuracy of the results is not 100%. The reasons that may be erroneous analysis of hCG, - effect of the drugs, the growth of tumors, the study early. Another option - the specialists of medical institutions made a mistake, performing a diagnostic procedure, or mixed results.
The list of drugs that can affect the level of hCG
There are medications that cause when receiving increasing levels of hCG in the blood:
- Pregnil;
- Horagon;
- Profazi.
The form of release of these drugs - freeze-dried powder, which is prepared from the injection solution. The active substance is everywhere one - human chorionic gonadotropin.
Reduced hormone levels cause the following medicines:
- furosemide;
- diakarb;
- Veroshpiron.
These medicines are diuretics group. To reduce the concentration of human chorionic gonadotropin also be other drugs and herbal teas, which have a diuretic effect.
How long the test can not show pregnancy
When the egg is fertilized, it attaches to the uterine wall, the level of human chorionic gonadotropin in the body increases. Find out about this, you can use a pregnancy test. They are impregnated with substances that react to an increase in hormone levels in urine.
If after the test Use it appears 1 bar, it means that hCG negative. However, in some cases, this method shows no conception. We test different sensitivity to the hormone. In most cases, their reaction is manifested at the level of 20-25 mIU hCG / ml.
Tests is recommended to use no earlier than 2 weeks after sexual intercourse for several reasons:
- Sexual intercourse could take place before ovulation, ie. E. to yield mature egg from the ovary. Sperm can wait for it. They have within 2-3 days after ejaculation retained the ability to fertilize.
- After fertilization, the egg is always a pregnancy does not occur immediately. Within 3-4 days, a new cell (zygote) moves along the fallopian tube to the uterus. By the end of the first week of the embryo implantation occurs - to attach to the body of the mucosa.
- After implantation, it begins to increase the level of human chorionic gonadotropin. However, the concentration of this substance is not immediately 20-25 mU / ml. To a level of hCG can rise to 3-7 day embryo implantation.
There is no point in the test conducted after intercourse, or after a short time afterwards. In early pregnancy outcome to delay one - hCG negative.
species analysis
Level 2 show hCG diagnostic method:
- The general analysis of venous blood for the presence of the hormone. It is used for diagnostic purposes of conception, as well as appointed women as part of prenatal examinations in the II trimester of pregnancy.
- Free b-hCG analysis of venous blood. It sent to pregnant women after 35 years, in the presence of Down's syndrome in the history of genetic abnormalities in relatives. Results hCG can point to existing malignancy in a patient, genetic abnormalities in the fetus.
The rules of analysis
On delivery of a biological fluid is recommended to go in the morning on an empty stomach. The patient taking any medication, should call their doctor to specialist to see if something on the analysis of a blood hCG affected.
false positive result
About 2% of women after giving blood for diagnosis of pregnancy get an incorrect result - a false positive. The analysis may be wrong because of several reasons:
- There are malignant tumors, ulcers and others.
- Stopped the normal course of pregnancy. Chorionic villi are transformed into bubbles.
- To carry out treatment to normalize menstrual periods and getting rid of infertility. The therapy involves taking medications with chorionic gonadotropin.
- Recently it has been interrupted during pregnancy (spontaneously or artificially).
- There was a postmenopausal stage. When the ovaries cease to mature female germ cells, a hormone concentration increases slightly.
false-negative result
In some cases, a negative hCG and pregnancy - is. This is an incorrect result. False negative hCG during pregnancy can be caused by:
- belated attachment of the embryo to the uterine mucosa (11-12 day after the merger with the sperm egg);
- late ovulation has occurred (eg, 19-25 days of the menstrual cycle);
- too early in the implementation of the study.
The result may be negative due to the specific characteristics of an organism (e.g., due to slow generating hormone). If hCG showed no pregnancy, secondary diagnostic procedure required for clarification. It is prescribed for the negative result of a couple of days.
The probability of incorrect results is equal to 0, it is necessary to study to pay a visit to a specialist. Medical practice and give necessary recommendations (for example, advise at the time of stop taking medications that can affect the concentration of human chorionic gonadotropin).
