What does a blood test for CEA mean, what values ​​does it show, indications for diagnosis

The CEA tumor marker is among other types of tests that are necessary to examine a patient for the absence / presence of malignant tumors.

In adults, this substance is also present, but its purpose is not defined to this day. If the quantity changes, this is a signal for the possible development of oncology or another pathology or inflammatory process. Therefore, an indicator appeared as CEA tumor marker, which helps to determine the risk and presence of oncology in humans. Measured in nanograms per milliliter of blood (ng / ml).

Mensmokers – from 0,52 ng / ml to 6,3 ng / ml; non-smokers – from 0,37 ng / ml to 3,6 ng / ml.
CEA tumor marker norm in womensmokers – from 0,42 ng / ml to 4,8 ng / ml; non-smokers – from 0,21 ng / ml to 2,5 ng / ml.

Cancer is now one of the first places due to mortality in the world. And in order to prevent the development of a serious illness in time, the doctors created a sufficient number of various studies, tests and tests that can determine cancer even at the initial stage.

One of these tests is the analysis of CEA – for cancer embryonic antigen. This is a kind of tumor marker, which allows you to accurately establish the nucleation of a malignant tumor even in its very embryo.

In the article, we consider what the CEA is a tumor marker, what categories of citizens are recommended to take an analysis of, how to properly prepare for the examination. We will touch upon other important questions on this topic.

Cancer embryonic antigen (CEA or CEA) – a substance released only during the period of fetal development. In the embryonic period, the role of CEA is to stimulate cell division. After birth, the CEA tumor marker ceases to be produced and its amount gradually decreases.

In an adult, this antigen does not play a significant role in life and should be completely absent or detected in the blood as traces. In a healthy person, it begins to be produced only in pathological conditions – oncology, severe inflammatory processes, multiple benign neoplasms and autoimmune disorders.

CEA tumor marker is not used as the only diagnostic method, therefore, it is prescribed in combination with other laboratory studies and instrumental methods. Only a full examination allows you to accurately determine the cause of the tumor marker increase.

Initially, the CEA tumor marker was used to diagnose intestinal cancer, further studies have determined that the cancer marker also increases with cancer of a different location.

The CEA tumor marker allows you to determine the formation of any tumor at an early stage, but more often it is used to determine neoplasms of malignant origin that form in the digestive tract.

Analysis for cancer embryonic antigen is prescribed with the same frequency for examination of men and women with suspected cancer of reproductive organs. Therefore, the CEA tumor marker does not have a special gender.

If we track the CEA tumor marker in dynamics, then an ever-increasing indicator indicates malignant neoplasms. A slight increase, fluctuating within the same value, often indicates benign processes.

If the value of the tumor marker in the body then rises, then decreases, then chronic diseases with frequent relapses are suspected. During exacerbations, the level of CEA becomes higher than normal, and some time after the onset of remission, the antigen returns to normal levels.

A blood test for the CEA tumor marker is prescribed only for strict indications. If the doctor suspects the patient has oncology or pathological conditions of the internal organs, then this analysis is included in a comprehensive examination.

What symptoms indicate the need for examination:

  • shortness of breath of unknown origin;
  • hepatomegaly;
  • yellowness of the sclera of the eyes and skin;
  • persistent sweating;
  • chronic fatigue, lethargy;
  • prolonged gastrointestinal upset;
  • stomach ache;
  • decreased or complete lack of appetite;
  • causeless nausea and vomiting;
  • black feces or blood impurities;
  • internal hemorrhage;
  • untreated anemia;
  • the appearance of moles or age spots on the body;
  • sudden change in body weight up or down;
  • a sharp increase in the volume of the abdomen;
  • chest pain and tightness;
  • spotting from the vagina;
  • an increase in the size of the lymph nodes.

A history of tumor markers in patients with a history of cancer is necessary to monitor the effectiveness of therapy and confirm the success of the surgery.

Attention! Experts recommend taking the test for CEA tumor marker to people after 50 years of age working in hazardous industries and having a hereditary predisposition to cancer.

The CEA tumor marker should normally be absent from the blood serum or determined in trace amounts. Therefore, even a slight increase in the norm should alert the attending physician. A very high CEA tumor marker indicates that malignant formations are forming in the body.

Attention! An elevated CEA tumor marker after surgery to remove a tumor indicates a relapse of the disease and the formation of a secondary tumor.

In addition to malignant neoplasms, a high level of cancer-embryonic antigen indicates various pathologies that are not related to cancer:

  • liver damage – cirrhosis, hepatitis;
  • digestive tract polyposis;
  • cystic formations of internal organs;
  • benign tumors;
  • ulcerative erosive lesions;
  • pancreatic dysfunction;
  • pathology of the urinary system;
  • severe respiratory diseases;
  • chronic foci of inflammation;
  • systemic autoimmune disorders.

The reasons for the high concentration of the tumor marker can be very different. Even the patient’s lifestyle can influence the level of antigen. Frequent and excessive alcohol consumption, long smoking history are factors that can provoke excessive release of CEA. The attending physician must take into account all the factors, prescribe a full examination before making a diagnosis.

Analysis of the CEA tumor marker requires special training, as various factors can influence the results.

Particular attention is needed to patients with bad habits, namely nicotine addiction. This is because nicotine affects the results.

Therefore, on the day of taking the analysis, you need to quit smoking, and the doctor deciphering the results should be warned about your dependence.

How to prepare for blood sampling:

  1. During the digestion of food, enzymatic substances are released, which in structure resemble tumor markers. Therefore, it is necessary to adhere to proper nutrition per day – exclude smoked, salted, pickled and seasoned foods. And in 8 hours completely refuse food, and use only clean water.
  2. A few days before blood sampling, completely abandon alcohol and energy drinks. It is also advisable to reduce the use of coffee and strong tea.
  3. On the eve to exclude any load – psycho-emotional and physical, in order to exclude the increased production of hormones that can affect the test results.
  4. For 1-2 days, you need to refuse treatment with any medications. If it is impossible to cancel the vital medicines, a laboratory technician and the attending physician should be warned about this.

Blood for the study of tumor markers is taken from the patient’s ulnar vein. Enough 3-5 ml. To examine the biomaterial and get information about the concentration of antigen in the blood. In paid laboratories, results can be obtained one day after blood sampling.

Decryption of the CEA tumor marker is carried out not only on the basis of blood test data. An oncologist must take into account all the possible factors affecting the results – smoking, taking medications, the presence of concomitant diseases, the state of the hormonal background and other history data.

Decryption should be compared with patient complaints, clinical manifestations and data from other laboratory tests and instrumental examinations.

The rate of CEA tumor marker in men with nicotine addiction is higher than in non-smokers. The same applies to women, so the norm of cancer antigen is the same for both sexes. The interpretation of the indicators of the CEA tumor marker is presented in the table.

Nicotine addicted patients0,8595
Non-smoking patients0,166,53,5
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The rate of CEA tumor marker in women usually ranges from 2,5 to 5 ng / ml., Depending on the level of hormonal levels.

During pregnancy, an increase in rates above normal is possible, since the antigen produced by the embryo is able to penetrate the mother’s systemic bloodstream.

older people are prone to oncology, so the rate of CEA tumor marker can be overestimated, especially if the patient has bad habits or chronic diseases of internal organs.

The CEA tumor marker cannot be used as the only method for the diagnosis of cancer – a diagnosis can only be made on the basis of a comprehensive examination.

General and biochemical blood tests are always included in the list of mandatory examinations. If a cancer tumor is suspected or if a diagnosis is already made, these tests are given regularly to monitor the patient’s condition.

CEA cancer embryonic antigen or, as it is also called, carcinoembryonic antigen (CEA) is a substance that in a healthy person can be found in trace concentrations in blood serum, however, its excess indicates the development of pathology.

Often, patients whom the doctor sent for this type of study ask themselves – what is CEA and what does it show?

Cancer-embryonic antigen is an oncomarker, first isolated in 1965 by S. Friedman and colleagues from cancer cells of the colon of a sick person. The molecular weight of the glycoprotein molecule varies from 180 to 200 thousand Daltons. A distinctive feature is the predominance of the carbohydrate part over the protein (about 60%).

Preparation for analysis and sampling

Most often, venous blood is used to determine the level of CEA. Special preparation for the sampling procedure is not required. As a rule, it is performed in the morning, on an empty stomach. If blood donation is scheduled for another time of the day, it is recommended to withstand 4 hours after eating. This measure is necessary because individual food components may affect the activity of the reagents used in the study.

It is proved that smoking increases the likelihood of a false-positive result, so 24 hours before giving blood, you need to abandon this habit. Over the past 30 minutes, physical and emotional stress should be ruled out. Blood for analysis on CEA is taken from the ulnar vein, collected in a sealed tube and sent to the study on the same day.

In the laboratory, the biomaterial is first placed in a centrifuge – the blood is separated into plasma (liquid part) and shaped elements (clot). Then fibrinogen is removed from the plasma. The resulting serum is subjected to chemiluminescent immunoassay. This method is based on the ability of CEA to form complexes with antibodies linked to the enzyme.

The mixture is washed and combined with a chemiluminescent substrate – a special substance that, when interacting with the enzyme, emits a non-thermal glow. The photon flux intensity is recorded by the apparatus; the obtained values ​​are used for further calculation of the concentration of cancer-embryonic antigen. The analysis procedure takes about 2 hours, the results are prepared within 1 business day.

Indications for conduction

Analysis of the CEA / CEA tumor marker is prescribed during a standard preventive examination for patients at risk for the development of such diseases:

  • Crohn’s disease;
  • ulcerative colitis;
  • pulmonary tuberculosis;
  • cirrhosis.
  • rapid weight loss;
  • general weakness and poor performance;
  • persistent nausea, often accompanied by bouts of vomiting;
  • pathological increase in the volume of the abdomen;
  • the presence of blood clots in the feces and too loose stools for a long time;
  • severe anemia;
  • excessive sweating and the appearance of constant shortness of breath;
  • compaction of the lymph nodes;
  • the appearance of age spots on the skin;
  • breast compaction.
  • high erythrocyte sedimentation rate in the UAC (general blood test).

The direction for such an analysis is prescribed exclusively by the doctor in case of suspected development of oncology in the patient. Based on the result of collecting a medical history and patient complaints, the doctor will assess the need to determine the level of specific substances. For example, a patient may be referred for analysis for tumor markers CEA, CA 19-9.

CA 19–9 is the second most important indicator after CEA, which determines the development of malignant processes in the pancreas. Special preparation for testing is not required. But in order for the results of the analysis to be accurate, the patient is advised to adhere to the following rules:

  • Do not eat 10 hours before the procedure;
  • do not smoke for at least 5 hours before blood sampling;
  • women are recommended to donate blood for CEA no later than the third day after the end of menstruation.

Also, before the study, it is recommended to minimize physical activity and refuse to use any medications, since they can cause a distortion of the result. Most doctors also do not recommend taking an analysis immediately after some diagnostic procedures, such as ultrasound, radiography and biopsy.

Normal values

Normally, the CEA level in the blood ranges from 0 to 5 ng / ml. However, in approximately 1% of non-smokers, rates can reach 10 ng / ml. Among smokers, about 4% have elevated CEA levels of up to 10 ng / ml, approximately 1% are high, more than 10 ng / ml. In addition, the amount of cancer-embryonic antigen increases with frequent use of alcohol.

Rate increase

Oncological diseases are the reason for a significant increase in the level of CEA in the blood. In such cases, the antigen concentration exceeds 20 ng / ml. Especially often, the secretion of glycoprotein increases with the development of a malignant tumor in the rectum and large intestine. A stable growth of indicators, their value above 30–49 ng / ml is determined with damage to liver and bone tissues by metastases.

In addition, sometimes the amount of cancer-embryonic antigen increases with the oncological process in the bronchi, in the mammary and sex glands, in the prostate and pancreas. The antigen concentration is from 10 to 20 ng / ml for somatic diseases accompanied by inflammation, as well as for the development of benign tumors.

CEA tumor marker: analysis norm in men and women, transcript

Only a doctor can make a final diagnosis, starting from the results of the CEA analysis and other examinations assigned to the patient. In most cases, the decryption of the analysis takes no more than 8-10 days. If the results are needed urgently, the analysis is best done in a private laboratory, as paid clinics provide information faster.

ParameterReference valuesUnits


Normally, the concentration of cancer-embryonic antigen is low or it is not determined. However, a negative result is not an absolute guarantee of the absence of a malignant tumor, this must be taken into account when interpreting the results. In patients with cancer, the cause of a decrease in the level of CEA in the blood is successful therapy, a state of remission. If the antigen concentration decreases after removal of the neoplasm, the course of radiation and chemotherapy, the prognosis of the disease is favorable.

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Because of what CEA can be increased

If the analysis shows that the concentration of CEA exceeds the permissible values, this does not mean that the patient has cancer. Specialists warn that different reasons can provoke an increase in the indicator, the same for both men and women. As medical practice shows, a significant increase in the CEA tumor marker and pathological protein in the blood is always observed in smokers.

Also, an increase in the component can signal the following pathological processes:

  • inflammatory process of internal organs;
  • pulmonary tuberculosis;
  • cirrhosis of the liver;
  • severe pancreatitis;
  • increase in liver volume;
  • hemangioma;
  • Crohn’s syndrome;
  • the formation of benign neoplasms (lipomas, polyps).

If the reason for the increase in the indicator is not in oncology, the CEA concentration will be increased slightly – no more than by 5–10 ng / ml. Moreover, in the future, the indicator will not grow even in the absence of therapy.

If the concentration of the protein component exceeds the norm by more than 10 units, it is necessary to conduct additional analyzes and examination of the affected organ, which will help to identify the localization and stage of tumor development.

Abnormal Treatment

In clinical practice, a blood test for CEA has the greatest diagnostic and prognostic value in cancer of the colon and rectum. The results help to identify the disease, track the effectiveness of therapeutic measures, determine relapse and the spread of metastases. With the results of the study, you must seek the advice of your doctor – oncologist, surgeon, gastroenterologist.

CEA as a diagnosis of cancer

If the patient is diagnosed with cancer, the CEA tumor marker (SEA) is examined several more times. The first time a second analysis is done to confirm the alleged diagnosis. In this case, not only the concentration of CEA, but also other oncological markers is revealed.

If the disease does not require surgical intervention, the patient will have to donate blood for CEA every two months so that the physician can evaluate the effectiveness of the prescribed treatment regimen and, if necessary, correct it. Periodic carrying out of such a procedure helps to predict the further development of the disease and minimize the risk of metastasis to other organs.

Example of REA analysis results form

If the patient was prescribed surgical treatment of the tumor, blood donation for CEA is necessary to determine the risk of relapse and the likelihood of secondary tumor formation. Doctors assure that if over 2 years the indicators do not increase, this indicates the onset of remission and indicates a favorable prognosis for the patient.

What the embryonic gene shows

Oncomarkers in human blood are used to diagnose and treat cancer. In the presence of cancers, the antigen level rises. By the presence of the number of markers, the disease and the effectiveness of the treatment are evaluated.

By the presence of the substance, it is impossible to determine the exact diagnosis, only suspicions: if it is elevated, then there are deviations. If the number of markers is increased, additional examinations are prescribed to the patient.

CEA shows the possible presence of cancer, but the final diagnosis is made after a complete examination of the body.

CEA is a cancer-embryonic antigen. Discovered in 1965 by Dr. S. Friedman and other doctors. The antigen is obtained from the cells of the stomach of a patient with a cancer patient. An antigen molecule, a glycoprotein has a molar mass in the range of 181 to 201 thousand daltons. The cell has a greater angle than protein at 60%.

Having deciphered the chemical composition, it was found that CEA is in connection with hetero-oligosaccharides and shows the protein nature. Today, the significance of antigen for an adult is unknown. During ontogenesis in a child, the substance is secreted in large quantities by the epithelium of the stomach and is involved in cell division, accelerating it. The substance produced is called a glycoprotein, abbreviated CEA.

CEA is found in minimal doses in the epithelium of the lungs and digestive organs. In an adult, organs produce a small amount of a substance. A small amount of synthesis occurs in the mammary glands. The substance is almost not found in the blood during pregnancy.

Antigen substance is important for laboratory research, a little less – for biological values.

For the detection of cancerous tumors is considered the main indicator. The name “embryonic” says that protein is important at the stages of fetal development. Detection of a gene by an immunochemical reaction is called an antigen. Its action is aimed at binding to specific antibodies.

The tumor marker does not show antigenic features and is not involved in the processes of the immune system. In the human body, a protein antigen does not produce antibodies for immunity.

Blood tests are carried out for the presence of antigen to prevent cancer. Cancer-embryonic antigen shows malignant and benign tumors.

An accurate diagnosis is made in the presence of cancer of the intestine and related organs – this is the large and small intestine. In a normal state in humans, the amount of this protein is insignificant, and with a malignant pathology, the level rises to a large or critical level.

Thanks to the carcinoembryonic antigen, the presence of other diseases is determined by difference from oncology, as well as autoimmune pathologies and inflammations.

According to the state of the tumor marker, an effective method of treating an oncological tumor is established. If a tumor is removed, the antigen level should return to normal when complete.

If the decrease does not occur, a conclusion is drawn about the unsuccessful treatment, adjusting the course.

If the level remains high during surgery, consider relapse or the development of metastases in organs and tissues nearby.

In the latter cases, the treatment method is changed or procedures are performed to achieve the optimal result. When treatment does not help, the use of aggressive drugs is considered. The side effects and consequences of the development of the tumor are evaluated and the weighting side is chosen.

If lesions are found in the images or ultrasound, the patient is prescribed tests for a cancer-embryonic antigen. Signs showing oncological pathologies in humans:

  • density of mammary female glands;
  • discoloration of the nipple of the chest;
  • irregular structure and enlargement of the mammary gland;
  • secretion of sticky fluid from the nipples;
  • violation of the period of menstruation;
  • drops of blood or bleeding from the anus;
  • blood with a smell from the vagina;
  • constant urination;
  • stomach problems
  • frequent nausea and vomiting;
  • loss or weight gain for no apparent reason;
  • excessive sweating;
  • thickening of the lymphatic organs;
  • fatigue, drowsiness;
  • mental disorders.

The analysis takes place throughout the course of therapy to monitor the dynamics of the action of drugs and to exclude the spread of metastases during surgical removal of the tumor. After treatment, the patient undergoes rehabilitation with constant monitoring of the antigen in order to exclude complications and identify an early relapse.

Before analysis, preparation is needed to identify the correct diagnosis. If not observed, the laboratory result will be false or distorted. The research material is blood plasma taken from the vein of the hand. Blood is placed in single-use tubes.

The patient must comply with the rules before taking a cancer antigen test:

  • It is unacceptable to eat fatty, smoked foods a day before the test, 9 hours before the procedure completely eliminate food. Explanation: When digested in the blood, similar components will develop that are easily confused with tumor markers. Food components are similar to the latter. The result will be inaccurate.
  • The night before the procedure, it is allowed to drink non-carbonated water, and a couple of hours before the analysis it is worth drinking 1-2 glasses of water. This will make blood thinner and relieve thickening after being placed in the flask.
  • In 30-40 minutes prior to visiting the office, overexertion and excitement are excluded so as not to distort the hormonal background. Activity causes changes in the endocrine system. To avoid false results, you need to calm down before visiting a doctor.
  • Stop taking medication within 24 hours. If, for various reasons, the selected drugs cannot be stopped taking, you need to coordinate this with the laboratory staff. Then, blood tests will take into account age, gender, alcohol and cigarettes, as well as taking drugs.
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The procedure is short, without time to prepare and take material for study. Data acquisition takes up to 24 hours. The price varies depending on the clinics, as different equipment and other factors are used, and starts from 600 rubles.

The level of CEA with sex, age and other reasons is not related. Men and women have the same normal antigen level. Cigarettes and alcohol change the level. In a smoker, the indicated level is increased, this fact is taken into account when receiving the results of analyzes.

The normal level for non-smokers is from 0 to 3,9 ng / ml, the permissible rate of a smoker is up to 5,6 ng / ml.

It is proved that the oncological process is associated with the level of tumor marker. In the early stages of cancer, the indicator remains within normal limits or slightly exceeds it.

Attention! You can not independently evaluate the results of the test and choose a treatment. Such actions lead to problems in the course of the disease and complicate further treatment, leading to serious consequences.

If the tumor marker in human blood is normal, there is a lack of cancer. Diagnosis of oncological diseases by the CEA study method is not the only diagnostic method.

Other methods of laboratory and physiological studies are also used to detect cancer. There are cases when the cancer was present in a severe stage, and the cancer embryo was normal.

Diseases and ConditionsIncrease 3 ng. / Ml.Increase 10 ng. / Ml.
bowel cancer7655
Ovarian cancer3522
Stomach cancer7034
Breast cancer6131
Lung cancer4425
Pancreas cancer7455
Cancer of other organs51135
Cirrhosis of the liver7034
Other non-malignant diseases3010

A slight change in the tumor marker in the blood occurs for various reasons, including those not related to cancer.

An increase in blood levels requires a thorough examination of the body and signals the presence of problems:

  • malignant formation in the digestive organs (intestinal tract, stomach, pancreas);
  • breast cancer;
  • lung pathology;
  • penetration of metastases into bone tissue and liver;
  • complication of the disease after surgery;
  • acute hepatitis;
  • cirrhosis of the liver;
  • pancreatitis in a complex form;
  • ulcerative colitis;
  • polyps (benign);
  • viral pathologies – pneumonia or bronchial asthma;
  • pathological disorders of the walls of the pulmonary alveoli;
  • bone inflammation;
  • problems in the functioning of the kidneys;
  • Crohn’s disease;
  • autoimmune abnormalities.
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A low tumor marker indicates that:

  • malignant pathologies are absent;
  • the onset of remission;
  • the right treatment for oncology.

The problem for determining the exact location of the tumor is the fact: tumor markers are produced by different human organs. The marker developed by a certain organ is different from the others; each must be examined. A table of 20 tumor markers has been built for compulsory study in the study of analyzes.

If an examination reveals an increased level of antigen in a person, extensive body tests are carried out – these are ultrasound, MRI and biopsy analyzes. After passing all the studies, when the overall picture is visible, they draw conclusions and make a final diagnosis.

An increase in CEA by 25-40% occurs with inflammation, immune diseases and benign cancer. You do not need to panic right away, it’s worth a complete examination.

An early detection of the disease often means a positive result. This helps to choose the right method of treatment without resorting to aggressive means. A positive outcome of the outcome is:

  • treatment that relieves the patient of the disease;
  • the onset of stable remission.

According to the conclusion of treatment, it is necessary to maintain visits to the doctor, donate blood for the study of cancer embryonic antigen a couple of times a year.

In conclusion, it should be noted:

  1. The analysis data should be evaluated only by a professional doctor, an independent conclusion is unacceptable.
  2. The final conclusion is made upon completion of all examinations, laboratory and physiological.
  3. An increase in CEA readings does not always indicate the presence of a malignant tumor. The third part of the increase is in benign cancer, immune and inflammatory diseases. They have a good cure rate.
  4. At the initial stages of the disease, the tests are close to normal, a thorough examination of the whole organism is necessary. The doctor will prescribe additional tests at the slightest suspicion of cancer.
  5. For a full assessment of the treatment, it is necessary to do tests in one laboratory. This will help to avoid false results due to errors in the equipment of different laboratories.


The study of tumor markers plays a crucial role in the diagnosis of cancer pathologies. Periodic preventive examinations help to timely identify the disease and prescribe an appropriate treatment regimen, which increases the chance of maintaining health.

If the doctor has prescribed testing for CEA, you need to approach this analysis very carefully and follow all the doctor’s recommendations for preparing for the procedure. Only in this case, the decryption will be reliable and will help to avoid confusion in assessing the state of health.

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Tatyana Jakowenko

Editor-in-chief of the Detonic online magazine, cardiologist Yakovenko-Plahotnaya Tatyana. Author of more than 950 scientific articles, including in foreign medical journals. He has been working as a cardiologist in a clinical hospital for over 12 years. He owns modern methods of diagnosis and treatment of cardiovascular diseases and implements them in his professional activities. For example, it uses methods of resuscitation of the heart, decoding of ECG, functional tests, cyclic ergometry and knows echocardiography very well.

For 10 years, she has been an active participant in numerous medical symposia and workshops for doctors - families, therapists and cardiologists. He has many publications on a healthy lifestyle, diagnosis and treatment of heart and vascular diseases.

He regularly monitors new publications of European and American cardiology journals, writes scientific articles, prepares reports at scientific conferences and participates in European cardiology congresses.