When to donate blood for hcg

Human chorionic gonadotropin is a hormone that is naturally synthesized by a fertilized egg from its implantation and the placenta throughout pregnancy. The basis of many tests for the determination of conception is the method of detecting hCG. We will understand when to donate blood for hCG.

What does abbreviation HCG mean?

HCG in early childbearing

HCG is a protein-based hormone called chorionic gonadotropin. It is produced by the placenta since the implantation of the egg into the lining of the uterus. This hormone can be detected already on the 9th day after conception and during the entire period of pregnancy.

The rate of its secretion increases rapidly, doubling every 48 hours until it reaches a maximum after 2-3 months and then decreases before the onset of the 4th month of pregnancy. HCG disappears from the woman’s body one week after the birth of the child.

However, hCG can be in the body not only in pregnant women. In this case, the presence of this hormone speaks of certain pathologies, since it can produce some types of cancer cells. Gonadotropin increases in testicular or placental chorionic carcinoma, testicular tumors, germ cells and ovaries, pancreatic cancer, stomach, colon, or kidney cancer.

Analysis of blood samples for the detection of gonadotropin is needed for early diagnosis of pregnancy and control over its course. And also in order to confirm the pathological development of pregnancy and the detection of malignant tumors.

Especially important is the role of hCG in the early stages of childbearing, since it is due to the synthesis of hormones that support pregnancy. These are hormones such as estrogen and progesterone. If the pregnancy proceeds without pathologies, starting from the second trimester, these important hormones are produced by the placenta.

Optimum timing for HCG detection

The presence of hCG in blood samples is one of the most reliable methods for the early detection of pregnancy. In principle, any woman can learn about conception with the help of a rapid test. Its action is based precisely on the detection of hCG contained in urine. And yet the most reliable way to conduct laboratory analysis of blood samples.

Where can I donate blood for hCG? As a rule, do a blood test for gonadotropin in a private or hospital laboratory. Laboratory studies are carried out using a sufficiently sensitive method, which almost always allows you to establish a pregnancy after one or two days of delay in the monthly cycle.

However, given the individual characteristics of the female body, the rate of production of hCG can all be different. Therefore, the optimal period is when you need to donate blood for hCG to detect pregnancy, 3-6 days after the delay. If doubts arise in the results, the test is repeated two more times with a three-day interval.

How to donate blood to determine pregnancy?

How to donate blood to determine pregnancy

For analysis, a venous blood sample is taken, as a rule, in the elbow bend. There are no unusual requirements in preparation for the analysis, and what to look for, the doctor will tell, taking into account your individual characteristics. We will tell you in general about how to donate blood for hCG correctly:

  • it is desirable to take the analysis in the morning from 8 to 11 o'clock;
  • before the procedure is not recommended to eat at least 4-8 hours, while allowed to drink;
  • one day before the test, try to consume food moderately, do not overeat;
  • Tell your doctor about the medications you are taking, especially hormones.

If necessary, you may need to pass urine. In this case, the collection of urine is carried out in the morning.

Interpretation of the analysis on HCG

The table shows the normal values ​​of hCG in the blood of pregnant women (mIU / ml).

Gestational age

Average value

Minimum level

Maximum level

2nd week




3rd week




4th week




5th week




6th week




7th week




8 weeks




If there is no pregnancy, the hCG value is less than 5 mIU / ml. The level of gonadotropin from 5 to 25 mIU / ml does not confirm and does not disprove the pregnancy, therefore a repeated analysis is necessary after two days.

Consider the normal level of gonadotropin contained in urine.


A piece of chalk

Have pregnant

  • 250-1000 from the second week of pregnancy;
  • up to 200,000 - the maximum value on the 2nd and 3rd month;
  • from 4 months remains stable until the end of pregnancy;
  • 0 - 7 days after delivery.

If there is no pregnancy


Deviations from normal values

Elevated gonadotropin during pregnancy

Elevated gonadotropin during pregnancy is observed in such cases as:

  • multiple births;
  • toxicosis or preeclampsia;
  • diabetes;
  • malformation in the development of the fetus, for example, when Dainism;
  • incorrectly established period of pregnancy;
  • exposure to hormone therapy.

High gonadotropin in women who are not carrying a baby indicates possible pathologies, such as:

  • swelling in the ovaries;
  • stomach or intestinal cancer;
  • a neoplasm in the uterus, kidney, or lungs;
  • cystic skid, chorionic carcinoma;
  • condition after abortion after no more than five days.

In the case of an increased level of gonadotropin after a mini-abortion, it can be concluded that it was not possible to terminate the pregnancy in this way.

Reduced hCG in pregnant women is evidence of:

  • errors in the pregnancy;
  • the threat of abortion spontaneous;
  • ectopic fetal development;
  • dysfunction of the placenta;
  • true post-term pregnancy;
  • in the period from 13 to 30 weeks - the death of the embryo.

The complete absence of hCG in the blood can mean an early analysis or an ectopic pregnancy.

Regardless of the results of the analysis, only a qualified specialist can make final and correct decoding and make a diagnosis taking into account the data of a comprehensive survey and additional research methods.

Add a comment