Is blood testing allowed during menstruation?


Many of the fair sex are concerned with this question - to donate blood during menstruation: can or not and why? Before answering a similar question, two important points should be taken into account. First: it is important for what exactly the blood is taken, for what purpose it gives up. And the second point: what kind of species will be supposed to conduct the study itself of the obtained biomaterial.

What nuances should be considered when giving blood on critical days?

In truth, there are no contraindications or prohibitions for blood donation during menstruation. But in cases where the talk is about donating blood as a donor, then doctors do not recommend such a procedure during menstruation. And girls often have a question in connection with this, why is it not advisable to donate blood during menstruation?

The answer to such a reasonable question lies in the fact that during the period of critical days for women, the concentration of hemoglobin in the blood decreases markedly. And, of course, it is bad for the well-being and condition of the girl, in general. And if you admit blood loss in addition, acting as a donor, then such a fact can aggravate the situation.

In order to clearly understand and realize whether it is possible to donate blood during menstruation for the purpose of analysis, one should know and understand what happens in such periods with the fragile body of women.

First of all, with menstrual flow ESR (namely, the erythrocyte sedimentation rate) is greatly increased. If the doctor, who deciphers the results of such an analysis, does not know that the girl underwent this procedure during menstruation, then he mistakenly can understand a similar change in this basic parameter, as an organism response in response to developing inflammation.

It is also necessary to take into account the fact that during blood sampling from a vein, the result of the study may be distorted due to the activation of the coagulation system during such a period. In the process of sampling, the blood itself may clot, and subsequently the result of the study will be distorted. When conducting a general blood test and as a result, in the period of menstruation during the first days, the erythrocyte levels, as well as hemoglobin, can increase in girls, and then these indicators, on the contrary, decrease significantly.

When can blood be taken for analysis?

Girls often ask their doctors if they are allowed to donate blood for analysis during menstrual flow, and for what reason you shouldn’t.

At present, gynecologists respond to this by saying that blood can be donated, of course, for analysis, but only after three to five days after the end of menstruation. Usually this amount of time is quite enough for all the basic blood parameters to be normal.

If we talk about why doctors do not advise donating blood for analysis during critical days, we can identify several main reasons. On such “interesting” days for girls, the hemoglobin level decreases during natural blood loss. Just as a result of this process occurs the phenomenon of activation of the coagulation system. This phenomenon has a direct effect on such an indicator as blood viscosity. For this reason, during the study and biochemical analysis, you will get a distorted and unreliable result that does not correspond to reality in the normal state of the girl's body.

You should also know that during such periods, women have a change in the level of platelets, this should also be a reason for refusing blood tests on "red" days. Such a change in the body causes the phenomenon of activation of the above coagulation system. Thus, the body of the female is protected from excessive blood loss. And as a result of biochemistry, the level of blood platelets or the concentration will be slightly below normal.

What do you need to know and follow to get the correct analysis results?

Each of the representatives of the female half of humanity should know how many days after how many days a blood donation is allowed for analysis. And if all the same, on the recommendation of a physician, it is necessary to conduct an analysis at this particular time, then it is necessary to tell the doctor about it.

In addition, there are some rules that are recommended to follow:
- blood for analysis on an indicator of the level of hormones should be donated in the morning,
- blood should be donated on an empty stomach, which means that food intake will have to be stopped 10-12 hours before the biomaterial is collected,
- blood donation should be made 5 days after the end of the month, not earlier.

Main aspects

Blood test during menstruation

First of all, it should be noted that menstruation is not a contraindication to blood donation. All that is necessary is to warn the doctor who will write out a referral for a study about the onset of the menstrual cycle. He, in turn, will make the appropriate mark on the form.

If the representative of the weaker half of humanity has the possibility of testing after the end of menstruation, then the best option would be to wait. Then there will be no doubt about the accuracy and reliability of the survey. It is not recommended to conduct the delivery of such surveys during this period as:

  • complete blood count - there will be a decrease in hemoglobin, platelets and leukocytes,
  • blood chemistry,
  • on sugar,
  • allergy tests, because during this period the body becomes extremely sensitive and therefore the results will be unreliable,
  • determining the clotting time, it will be reduced,
  • immunological analysis, because during menstruation there will be a false positive result,
  • PCR,
  • tumor markers,
  • for infectious diseases, by transmission of which is considered sexual.

These analyzes will lead to changes in some indicators. For example, a general blood count will indicate erythrocytosis, leukocytosis and thrombocytosis. And this may indicate the presence or the formation of inflammatory or infectious genesis in the human body.

Distortion of results is quite often observed as a result of an increased level of blood clotting. It is necessary to focus on the fact that if its fence is taken from a vein, it can immediately collapse and biochemistry or any other study will not be conducted.

Such possible changes are explained by the fact that the menstrual period is a kind of stressful situation for the body, accompanied by nervous excitement and exhaustion.

It must be remembered that for some women, blood tests during menstruation can lead to additional stress on the circulatory and nervous systems. And this in turn will manifest a deterioration of the general condition.

The blood component will also be altered if you are taking analgesics or antispasmodics.

The list of examinations, the results of which are not affected by the menstrual cycle

Types of tests not related to menstruation

There are a considerable number of tests that allow blood donation during menstruation. These are mainly hormone level tests.

The amount of hormones associated with the menstrual cycle, their rate may vary and reach the top in a certain period of time. The best period for such tests is menstruation or 6-9 days after its termination. Analyzes allow you to diagnose the indicators:

  • prolactin
  • estradiol,
  • FGS,
  • luteinizing hormone
  • cortisol
  • testosterone,
  • follicle-stimulating hormone.

Note that taking a blood test during menstruation for a blood test for FGS, LH and prolactin is better during the period from the third to the fifth day of the cycle, testosterone - from the eighth to the tenth day, and progesterone and estradiol - from the twenty-first to the twenty-second day of the menstrual cycle .

Do not affect the monthly and the results of the analysis on the diagnosis of syphilis. It is also allowed to undergo tests in order to identify the process of infectious origin or to conduct a serological analysis.

If the doctor prescribes an examination of the body through tests, then the best option would be to clarify the time of their passage. If he does not give any special instructions and recommendations, then tests can be taken on any day of the cycle. However, a significant proportion of medical workers still insist on testing no earlier than 3-5 days after the end of the month.

On the day of the examination, it is necessary to follow the generally accepted recommendations:

  • the test must be taken on an empty stomach,
  • need to abandon the consumption of fatty foods and sweets,
  • do not drink coffee and caffeine containing drinks,
  • avoid drinking alcoholic beverages,
  • Do not smoke.

On the eve of the survey, it is necessary to stop taking any medication, because they can have a distorting effect on the results, leading to unreliability.

The results of the analysis, which is considered to be the norm

Complete blood count during menstruation will provide indicators:

  • leukocytes, their usual number (from 3.5 to 10 000 per 1 ml of blood) can be changed with an increase in the number of possible infectious or inflammatory process in the body,
  • erythrocytes (normal from 3.8 to 5,800,000 per 1 ml), an increase in their number indicates a malfunction of the cardiovascular system, poisoning or dehydration of the body, a decrease indicates constant blood loss, hemolysis of erythrocytes, the onset of pregnancy or an increase in the amount of salts in the body ,
  • hemoglobin (normal from 120 to 160 g / l), which during menstrual blood loss will be reduced, but with a significant decrease you need to think about anemia, and with an increase about problems with the process of blood clotting and even chronic leukemia,
  • the color indicator (its normal result is considered to be from 0.85 to 1.05) exceeding this figure would indicate the synthesis of hemoglobin or a decrease in the size of erythrocytes, and a decrease below the permissible rate will indicate the development of such pathological processes in the body as macrocytosis, folio-deficiency anemia, vitamin B12 deficiency,
  • hematocrit (the norm is from 35 to 45%).

Blood tests during the menstrual period

Blood tests during the menstrual pause

A blood test during the menstrual pause has an extremely high level of efficiency, especially if it is taken during the period from 7 to 15 days of the menstrual cycle. This time is considered the best option for passing surveys. This is explained by the fact that the body was already able to recover from blood loss and had not yet had time to prepare for the next one.

On the remaining days of the cycle, testing is recommended only when absolutely necessary, if you feel unwell, to make a diagnosis or to prescribe a treatment regimen. But in this case it is necessary to warn your doctor that the tests were taken during menstruation. This is what he must take into account when analyzing the results obtained.

In any situation, you don’t need to contact the laboratories for blood tests without prior consultation with the doctor, because the female body is not always ready for this kind of manipulation. This is particularly acute during menstruation and in the period when a woman carries a child, since during this period a considerable amount of changes occur in the female body that cannot but affect the performance indicators.

Summarizing the above information, it should be noted that the menstrual cycle, as well as pregnancy, is considered to be not the best time for testing with a preventive purpose. Particular attention should be paid to the choice of a laboratory and clinic, if necessary, to obtain accurate and correct results. It is better to spend more time searching for an institution than to torture your body with repeated control tests, in order to confirm or deny the diagnosis. That is practically all the basic information about which surveys can be carried out and which can not. You now have the information about the changes that the survey indicators undergo during monthly periods.

Is it possible to donate blood during menstruation

Men are much easier in this respect, their hormonal levels are relatively stable. In women, the ratio of different hormones varies depending on the phase of the overall menstrual cycle. Blood for most types of research is better to donate between menstruation. But one of the types of tests is not only possible, but it is necessary to take it during menstruation. This is a hormone test.


Blood for hormones is recommended to take on 5-7 day of menstruation, because at this time you can get the most objective picture of the hormonal state of the body. Research on hormones provides information on the presence or absence of:

  • infertility
  • benign tumor in the uterus,
  • polycystic ovary syndrome.

The analysis of hormones is carried out in the event of a woman having problems with conception. The study is carried out on the following hormones:

  • progesterone,
  • luteotropin,
  • prolactin
  • follitropin,
  • testosterone,
  • estradiol,
  • dehydroepiandrosterone sulfate.

In some women, menstruation is so painful that they are forced to take painkillers. But some drugs affect hormone levels, so it is better to suffer a little before donating blood.

Diseases diagnosed with hormone testing:

  • dysfunction of the pituitary gland,
  • dysfunction of the ovaries,
  • ovarian reduction
  • tumors in the pituitary gland,
  • brain tumors
  • disruption of the thyroid gland,
  • autoimmune processes
  • adrenal gland disruption,
  • tumors in the ovaries.

Also, hormone levels are affected by obesity and alcohol abuse.

In this case, the monthly will not affect the presence of antigens during infection of the body with an infectious disease. You can also test for syphilis during your period. Almost all other tests pass in the absence of monthly bleeding.

Is it possible to take biochemistry during menstruation

When biochemical analysis, the doctor receives information about the work of the internal organs and metabolism. Since during menstruation the usual hormones are disturbed, the doctor will not be able to get reliable information about the body. Therefore, women are forbidden to donate blood for biochemistry during menstruation.

Although, if it is “a matter of life and death,” then such a study will not harm health. Is that a woman is afraid of the kind of blood. But in the analysis, taken during monthly bleeding, the doctor will have to take into account the instability of the hormonal background in order to correctly interpret the results.

Therefore, biochemistry is given not only during the absence of menstruation, but also on an empty stomach.

Is it possible to pass general tests during menstruation?

General clinical analysis is needed to assess the amount of hemoglobin, the content of leukocytes, erythrocytes, platelets and the erythrocyte sedimentation rate. With menstruation for the "convenience" of getting rid of the endometrium, all these indicators do not correspond to the norm. The hemoglobin level is usually lowered, the blood coagulates worse. So, these studies will be wrong:

  • white blood cell count can be increased, as in the presence of infection or inflammation in the body,
  • an increase in red blood cells under normal conditions indicates problems with cardiovascular disease, dehydration or poisoning,
  • a reduced number of red blood cells "normal" happens with constant blood loss, pregnancy or high salt content,
  • n hemoglobin indicates anemia,
  • elevated hemoglobin - a signal of problems with blood coagulation or chronic leukemia,
  • Elevated numbers in the color index indicate that hemoglobin synthesis occurs in the body, or the size of red blood cells decreases,
  • reduced color indicator - a sign of avitaminosis B12, folic deficiency anemia or macrocytosis,
  • too high hematocrit is a sign of erythrocytosis, leukemia, dehydration, reduction of plasma volume,
  • too low hematocrit t - anemia, protein poisoning, excess water in the body (puffiness).

But all these indicators will be true only under the condition that the woman gave her blood during the absence of her periods. If there was a need to donate blood during menstruation, you need to bear in mind that the result could be wrong for an objective reason.

Although this is a study about which they say "blood from a finger" and special requirements for it does not impose. Therefore, this analysis is often passed in the middle of the day after a hearty lunch.

Other analyzes

Blood for almost all studies, except hormonal, it is better to donate in the absence of bleeding. Sugar is also recommended to take on other days of the cycle, as the data may be distorted. Свертываемость во время месячных снижена, поэтому в дни кровотечения не рекомендуется делать исследование на свертываемость крови.


Назначается при достаточно серьезных и хронических заболеваниях:

  • Hiv
  • chronic diseases of the respiratory system
  • oncology,
  • metabolic disorders (diabetes),
  • chronic diseases of the digestive tract,
  • depletion or dietary restrictions: strict diets, including vegetarianism,
  • chronic fatigue syndrome
  • a sharp drop in weight for no reason
  • organ transplantation.

Conducted in many ways, depending on the need.

This study for the presence of viral diseases, including those viruses that have not manifested themselves for a long time in the human body. For the analysis of the polymerase chain reaction, other body secretions are also used. With monthly bleeding, the result may be distorted. If the PCR analysis, given during menstruation, was positive for viruses, it is better to pass it again after the end of the bleeding.

Is it possible to be a donor during menstruation

Is that silent after the onset of menstruation. Doctors categorically reject the impulses of women to become donors during menstruation. And it's not only in the hormonal background, but also in the fact that during the monthly bleeding in women hemoglobin falls. Blood sampling at this time may be fraught with fainting.

That is, with a weight of 65 kg, the maximum blood volume will be 5.2 liters. With a loss of 50%, a person dies. At donor points take 0.4-0.5 liters. That is, from the total allowable blood loss, it will be about 20%. It is not for nothing that donors after a blood donation are given a weekend, additional nutrition is prescribed and it is recommended to lie down immediately after the procedure.

With menstruation, women lose an average of about 100 ml of pure blood. That is, another 20-25% will be added to the standard donor norm. Under standard conditions, such blood loss is unacceptable. Therefore, in women with menstrual bleeding do not take either whole blood or plasma.

Is it possible to donate plasma

Plasma can be donated more often, and its loss affects health less. However, women with menstrual bleeding are also not allowed to plasma. However, its removal is less painful for the body, and the delivery is allowed more often than whole blood.

Why not donate blood during menstruation

Due to the body's need to quickly get rid of the old endometrium, the amount of hormones in a woman’s body during menstruation is much higher than normal, and other indicators are greatly distorted. Theoretically, it is possible to take into account these changes and amend the result. But in women, these changes are individual, and differ, as a rule, from cycle to cycle. Therefore, apart from hormonal, other studies are best done when the body has already gotten rid of components it does not need.

When is the best blood test?

Check for hormones - an exception to the rule. The remaining types of tests optimally take on day 5 after the cessation of bleeding. Terms of blood donation may vary depending on the type of check. In some cases, the analysis is done in the interval between 2 and 7 day after the cessation of menstruation. At this time, the body has already got rid of excess hormones and recovered from blood loss, but a new hormonal cycle has not yet begun.