Total autosomal monosomy is a very rare chromosome problem in which one whole non-sex chromosome is missing. It usually begins before birth and is not compatible with life in almost all cases. Many pregnancies with total autosomal monosomy end in early miscarriage, so there are often no lifelong features to manage. Not everyone will have the same experience, but if a pregnancy continues for a time, doctors may see severe growth problems and major organ abnormalities on ultrasound. There is no curative treatment for total autosomal monosomy, and care is focused on diagnosis, pregnancy monitoring, and support for the pregnant person and family.
How many people live with Total autosomal monosomy?
Worldwide, no living people are known to have total autosomal monosomy, which means a whole non-sex chromosome is missing; complete loss of any autosome is considered not compatible with life (MSD Manual Professional Edition, 2025). The same applies in the United States, with no known living cases reported (MSD Manual Professional Edition, 2025).
Overview
Total autosomal monosomySymptoms
Total autosomal monosomy is not compatible with life. In almost all cases, it causes very early miscarriage, often before a pregnancy is recognized, so there are no ongoing features in a living baby.
Outlook and prognosis
Total autosomal monosomy is not compatible with ongoing development. In almost all cases, the pregnancy ends very early, often before or around the time a pregnancy test becomes positive.
Causes and risk factors
Total autosomal monosomy is caused by loss of one entire non-sex chromosome, usually from a new error when the egg or sperm forms or just after conception. It is almost never inherited. There are no known lifestyle or environmental risk factors.
Genetic influences
Total autosomal monosomy is fundamentally genetic: it happens when one whole autosome is missing. It is usually caused by a random error very early in development, not by common inherited genetic variations.
Diagnosis
Total autosomal monosomy is diagnosed with genetic testing that shows a complete missing non-sex chromosome. In practice, the diagnosis of total autosomal monosomy is usually made in pregnancy tissue after a miscarriage, sometimes after abnormal prenatal ultrasound findings.
Treatment and drugs
Total autosomal monosomy is not treated with medicines because a complete missing autosome almost always causes early miscarriage. Care focuses on confirming the diagnosis, managing the pregnancy safely, and offering genetic counseling and emotional support for future family planning.
Symptoms
In most pregnancies, total autosomal monosomy causes development to stop so early that there are no features seen in a baby or child. The term means one of the non-sex chromosomes is completely missing, and that change is usually not compatible with life. Because the early features of total autosomal monosomy are most often a pregnancy that stops developing, it is usually found after a miscarriage rather than after birth.
Most pregnancies with total autosomal monosomy end in the first weeks because the embryo cannot keep developing. This may happen before a pregnancy is confirmed, so it can look like a late or heavier-than-usual period.
If miscarriage happens after a positive pregnancy test, vaginal bleeding and lower belly cramping are common signs. Some may also notice passing tissue or that early pregnancy symptoms start to fade.
On ultrasound, growth may stop very early or a heartbeat may never appear. These are medical signs that the pregnancy is not developing as expected.
Total autosomal monosomy usually does not lead to a recognizable pattern of features in a baby or child because complete loss of an autosome is generally not compatible with life. If chromosome testing is done after a miscarriage, the result may help explain why the pregnancy ended.
How people usually first notice Total autosomal monosomy?
How total autosomal monosomy is first noticed is usually not through symptoms in a child, because a complete missing autosome is almost always incompatible with life. In most cases, it is first recognized during very early pregnancy as a miscarriage, or it may be found on prenatal genetic testing after an ultrasound shows that the pregnancy is not developing as expected. For families, the first signs of total autosomal monosomy are therefore usually pregnancy loss or abnormal early prenatal findings, rather than features seen after birth.
Types of Total autosomal monosomy
Total autosomal monosomy means a full missing copy of one non-sex chromosome in all cells. In humans, this is generally not compatible with life, so people are not usually born with a complete autosomal monosomy. Because of that, no established clinical variants or subtypes are used in routine medicine or genetics for total autosomal monosomy.
No recognized types
No distinct types of Total autosomal monosomy are widely recognized. In practice, complete loss of an autosome is almost always lethal very early in development.
Can I slow down the onset of symptoms?
No. This chromosome problem means a pregnancy is missing one whole non-sex chromosome, and it usually leads to pregnancy loss very early, so there is no proven lifestyle change or medical treatment that can meaningfully delay symptoms or change the course once it has happened. If this has come up in a past pregnancy, genetic counseling and chromosome testing can help clarify future risk and options, and that information can still be useful even though it cannot prevent or slow this condition.
What genetics can tell you about symptoms
Genetics tells us that total autosomal monosomy, meaning a complete missing copy of any non-sex chromosome, is almost always not compatible with life. In practice, this change usually causes pregnancy loss very early, so there is not a typical pattern of symptoms seen in people living after birth. Because the chromosome loss is present from conception and is usually too severe for normal development, genetics mainly predicts very early and very serious effects rather than differences in which symptoms appear, how severe they are, or when they begin.
Causes and risk factors
Total autosomal monosomy usually happens when one whole non-sex chromosome is missing because of a random error in the egg, sperm, or very early embryo. It is usually a new genetic change and is not caused by something a parent did. In a small number of families, a parent carries a balanced chromosome rearrangement, and this can raise the chance of total autosomal monosomy. Knowing your family history is a good first step. No clear lifestyle or environmental risk factor has been proven, but doctors may also consider maternal age, past miscarriages, and chromosome test results when discussing risk in another pregnancy.
What are the most common causes or risk factors?
Total autosomal monosomy happens when a pregnancy starts with one whole non-sex chromosome missing, and this is almost always caused by a random mistake when the egg or sperm is made or very soon after fertilization. It is usually not inherited and is not caused by anything a parent did, ate, or was exposed to in everyday life. In a small number of families, the chance can be higher if a parent carries a rearrangement of chromosomes that does not affect their own health, and the overall risk of chromosome mistakes also tends to rise with older maternal age.
Environmental and biological risk factors
Because total autosomal monosomy is extremely rare, the risk factors for total autosomal monosomy are not mapped out as clearly as they are for more common chromosome conditions. Doctors often group risks into internal (biological) and external (environmental). In practice, most cases seem to begin with a chromosome error in the egg, sperm, or earliest embryo, while only a few outside exposures are suspected.
Most cases are thought to begin when chromosomes do not separate properly as an egg or sperm forms. This is usually a chance event, not something a family caused.
In some cases, the missing chromosome develops during the first few cell divisions after fertilization. When that happens, the error starts very early in development.
Older maternal age is linked to a higher chance of chromosome-number errors in eggs. That general pattern may increase the likelihood of severe chromosome abnormalities, although total autosomal monosomy is so rare that exact numbers are not available.
Strong radiation exposure can damage chromosomes in reproductive cells. A direct link to total autosomal monosomy is not firmly measured, but this kind of exposure is a recognized environmental risk for chromosome errors.
Genetic risk factors
For families, Total autosomal monosomy is most often experienced as a very early pregnancy loss rather than a condition a baby lives with. It usually happens when one whole non-sex chromosome is missing from the embryo from the start because of a chromosome-sorting error in the egg, sperm, or earliest cell divisions. Some risk factors are inherited through our genes. The main inherited risks are balanced chromosome rearrangements or, more rarely, mosaic chromosome changes in a parent.
Random sorting error: Most cases begin with a chance mistake while egg or sperm cells are forming, so one cell ends up missing a non-sex chromosome. This is the most common explanation behind the genetic causes of Total autosomal monosomy.
Early cell division: Sometimes the missing chromosome is lost just after fertilization, during the embryo's first few cell divisions. If every cell is affected, the pregnancy usually cannot continue, while loss in only some cells may lead to mosaic monosomy instead of Total autosomal monosomy.
Balanced translocation: Some parents carry a balanced chromosome rearrangement and stay healthy because no genetic material is missing or extra in their own cells. But that rearrangement can produce some eggs or sperm with a whole chromosome missing, which raises the chance of miscarriage or an embryo with Total autosomal monosomy.
Parental mosaicism: Rarely, a parent has a chromosome change in only some egg or sperm cells, even if standard blood chromosome testing looks normal. This can raise the chance of more than one affected pregnancy, so genetics evaluation may be discussed after repeated losses.
Lifestyle risk factors
For total autosomal monosomy, lifestyle habits do not cause the chromosomal change. There are no established lifestyle risk factors for total autosomal monosomy, because it results from a chromosome error rather than diet, exercise, or other personal habits. In discussions of how lifestyle affects total autosomal monosomy, the main relevance is support for maternal health during pregnancy care and recovery after the pregnancy loss that usually occurs with this condition.
Smoking, alcohol, and recreational drugs do not cause total autosomal monosomy, but they can worsen overall pregnancy health and complicate medical care during a miscarriage. Avoiding them may reduce added strain such as bleeding risks, poor healing, or emotional destabilization during recovery.
Diet does not create the chromosome loss behind total autosomal monosomy, but good nutrition and hydration can support strength, iron balance, and recovery if bleeding or pregnancy loss occurs. This is one of the few practical ways how lifestyle affects total autosomal monosomy in real-world care.
Exercise habits are not lifestyle risk factors for total autosomal monosomy, and routine physical activity does not trigger the condition. After diagnosis or miscarriage, activity may need to be adjusted based on pain, bleeding, fatigue, and clinician guidance so recovery is safer.
Poor sleep and high stress do not cause total autosomal monosomy, but they can intensify exhaustion, anxiety, and grief around diagnosis and loss. Prioritizing sleep and stress support may help emotional recovery and improve the ability to cope with treatment decisions and follow-up care.
Risk prevention
Total autosomal monosomy usually cannot be prevented in the usual sense, because it most often happens by chance when an egg, sperm, or early embryo ends up missing a whole autosome. In most cases, this leads to a pregnancy loss very early, often before someone even realizes they are pregnant. Prevention is flexible—it adapts to your life and health background. For families worried about future pregnancies, the focus is mainly on understanding risk, checking for rare inherited chromosome changes, and planning the pregnancy with specialist support.
Meeting with a genetics specialist before pregnancy can help clarify whether the event was likely random or linked to an inherited chromosome problem. This is especially helpful after recurrent miscarriages, infertility, or a family history of chromosome conditions.
Blood chromosome testing for both parents may be advised if there have been repeated pregnancy losses or a known family rearrangement. This cannot prevent total autosomal monosomy directly, but it can show whether the risk of chromosomal abnormalities in pregnancy is higher than expected.
Preconception care can improve overall reproductive health by reviewing medicines, chronic conditions, smoking, alcohol, and nutrition. While these steps do not reliably prevent a whole missing chromosome, they support a healthier pregnancy and may reduce other avoidable risks.
For some couples with a known chromosome rearrangement or repeated losses, IVF with embryo testing may help identify embryos that do not have major chromosome imbalances. This does not stop monosomy from occurring, but it may lower the chance of transferring an affected embryo.
Can you prevent Total autosomal monosomy?
No, total autosomal monosomy usually cannot be prevented. It happens when an embryo is missing a whole non-sex chromosome, and this is almost always a random event rather than something caused by anything a parent did or did not do. If there have been repeated miscarriages or known chromosome changes in the family, genetic counseling may help explain the chance of it happening again, but it cannot fully prevent this condition.
Transmission
Total autosomal monosomy is not an infection, so it cannot spread from person to person through contact, air, food, or sex. In most cases, how Total autosomal monosomy is inherited is that it is not directly passed down through families, but happens because of a random chromosome error when an egg or sperm forms, or very early after fertilization.
Because an entire autosome is missing, Total autosomal monosomy is generally not compatible with life, and most affected pregnancies end in miscarriage very early. Rarely, a parent may carry a balanced chromosome rearrangement that increases the chance of this happening in a pregnancy, so genetic counseling can help explain the risk for future pregnancies.
When to test your genes
Testing is relevant before or during pregnancy if there have been repeated miscarriages, a prior pregnancy with major anomalies, or ultrasound findings suggesting a chromosome problem. Total autosomal monosomy is usually not compatible with life, so testing is mainly used to explain pregnancy loss and guide future reproductive care.
Diagnosis
Total autosomal monosomy is usually identified very early, often during pregnancy, because having a full missing non-sex chromosome is generally not compatible with life. In most cases, the diagnosis of Total autosomal monosomy comes up after an early pregnancy loss, ultrasound concerns, or testing of pregnancy tissue. Getting a diagnosis is often a turning point toward answers and support.
Ultrasound may show that the pregnancy is not developing as expected, or that there are severe structural problems very early on. These findings cannot confirm Total autosomal monosomy by themselves, but they can raise strong concern and prompt genetic testing.
Doctors confirm Total autosomal monosomy by checking the number of chromosomes in cells from the pregnancy. This is the key step in the genetic diagnosis of Total autosomal monosomy because it shows that one entire autosome is missing.
Testing may be done on tissue from chorionic villus sampling, amniocentesis, or after a pregnancy loss on pregnancy tissue. The choice depends on the timing of the pregnancy and when the concern is first found.
The laboratory may use karyotyping, chromosome microarray, or related chromosome tests to look for large missing pieces or a whole missing chromosome. These tests also help rule out other chromosome conditions that can look similar at first.
How is Total autosomal monosomy diagnosed?
Total autosomal monosomy is diagnosed by chromosome testing, which checks whether the embryo or fetus has a whole missing non-sex chromosome instead of the usual pair. If a pregnancy is still ongoing, doctors may suspect a serious chromosome problem on ultrasound if growth has stopped or major problems are seen, but the diagnosis is confirmed with testing from chorionic villus sampling or amniocentesis, which collect cells from the pregnancy. In many cases, it is found after an early miscarriage when the pregnancy tissue is tested.
Stages of Total autosomal monosomy
Total autosomal monosomy does not have defined progression stages. This is because a complete missing non-sex chromosome is usually not compatible with ongoing development, so it most often leads to miscarriage very early in pregnancy rather than a condition that gradually changes over time. Many people feel relief once they understand what’s happening. The diagnosis of Total autosomal monosomy is usually made during pregnancy testing or after pregnancy loss, using chromosome testing on pregnancy tissue and sometimes blood tests from the parents to look for possible underlying chromosome rearrangements.
Outlook and prognosis
The outlook for total autosomal monosomy is extremely poor, because complete loss of any autosome is considered incompatible with normal human development. In nearly all cases, the pregnancy ends very early as a failed implantation, very early miscarriage, or fetal loss before the condition can be recognized clinically. Long-term survival is not expected for a fetus or infant with true total autosomal monosomy, and there are no established treatments that can change this prognosis. Mortality is therefore essentially 100%, usually during the earliest stages of pregnancy. Rare reports that appear similar often involve mosaicism or partial chromosome loss rather than true total autosomal monosomy, and those situations have a different outlook.
Long-term effects
Total autosomal monosomy is not expected to cause long-term features in a living child or adult because a complete loss of any autosome is generally not compatible with life. In practice, the prognosis for a pregnancy with Total autosomal monosomy is extremely poor, and the finding usually leads to pregnancy loss very early. For families, the day-to-day impact is most often tied to the pregnancy outcome and the need to understand what the genetic result means.
Total autosomal monosomy almost always leads to miscarriage in the first weeks of pregnancy. This happens because losing a whole non-sex chromosome disrupts development from the very start.
A complete autosomal monosomy is not compatible with ongoing fetal development or life after birth. For that reason, doctors do not expect long-term features in infants, children, or adults with Total autosomal monosomy.
The lasting effects are usually emotional and practical, related to pregnancy loss rather than a chronic condition in a child. Clear information helps families prepare for follow-up testing and understand whether this was most likely a one-time event.
How is it to live with Total autosomal monosomy?
Total autosomal monosomy is not a condition people usually live with after birth, because losing an entire autosome disrupts development so severely that the pregnancy almost always ends in very early miscarriage. That means the day-to-day impact is usually not about long-term symptoms in a child or adult, but about the physical experience of pregnancy loss and the emotional shock, grief, and uncertainty that can affect parents, partners, and the wider family. For many, the most important supports are clear medical explanations, compassionate follow-up care, and genetic counseling to understand what happened and what it may mean for future pregnancies.
Treatment and drugs
Total autosomal monosomy is not treated with medicines or surgery because a complete missing copy of any autosome is generally not compatible with life, and most affected pregnancies end in very early miscarriage. If this finding is suspected during pregnancy, care focuses on confirming the diagnosis with genetic testing, explaining what it means, and supporting the pregnant person through next steps. There is no drug that can replace a missing chromosome or correct total autosomal monosomy. Supportive care can make a real difference in how you feel day to day, and this often includes emotional support, follow-up with an obstetric specialist and genetics team, and guidance about future pregnancy planning. If you are looking for treatment for total autosomal monosomy, it can help to know that medical care is centered on counseling and support rather than a cure.
Can you cure Total autosomal monosomy?
No. Total autosomal monosomy, meaning a baby is missing one whole non-sex chromosome, cannot be cured because medicine cannot replace an entire missing chromosome, and in most cases it is not compatible with life. When this happens, care focuses on support, comfort, and helping the family understand what to expect rather than trying to reverse the condition.
Non-drug treatment
Total autosomal monosomy is not a condition that can be treated with exercise, therapy, or other non-drug approaches, because a complete missing autosomal chromosome is not compatible with ongoing life. In almost all cases, it leads to a very early miscarriage, often before there are clear pregnancy symptoms. For many, treatment begins not at the pharmacy, but with emotional support, clear information, and follow-up care after pregnancy loss. Care is centered on the pregnant person and family rather than on treating the chromosome change itself.
Medical follow-up after miscarriage helps make sure bleeding, pain, and recovery are going as expected. It can also address urgent problems such as heavy bleeding, infection, or severe cramping if they occur.
Counseling, bereavement support, and peer groups can help many living through pregnancy loss process shock, grief, or guilt. Sharing the journey with others can make an isolating experience feel more manageable.
A genetics specialist can explain what total autosomal monosomy means in plain language and why it almost always happens by chance. This visit can also help answer questions about future pregnancy risk and testing options.
Preconception counseling may help if you want to try for another pregnancy after a loss. You may need to try more than one strategy to feel prepared, from timing follow-up visits to discussing early ultrasound and prenatal testing.
Your genes may have an impact on how drugs work for you
Total autosomal monosomy means an entire non-sex chromosome is missing, and in almost all cases this causes pregnancy loss very early, so there are no standard day-to-day medicines used specifically for this condition in people who are living with it. Because of that, there is no well-established evidence that inherited genetic differences change how medicines work in this condition in a way that guides treatment. If a rare related situation is being discussed, such as a mixed pattern in only some cells, doctors usually choose medicines based on the person’s actual health problems rather than on the chromosome change itself.
Pharmacological treatments
Total autosomal monosomy is not treated with medicines because a complete loss of any autosome is not compatible with life. In practice, this means there are no approved drugs for total autosomal monosomy itself, and no standard medication plan exists. Care is centered on confirming the diagnosis, explaining what it means, and supporting the pregnant person and family. If this term came up during testing for a pregnancy, doctors usually focus on counseling and the next steps rather than prescribing treatment.
There are no medicines that can correct total autosomal monosomy or help a pregnancy continue when this finding is truly present. Medication can feel like a big step, but here the main issue is that the chromosome change affects development from the very start.
Drugs may still be used for comfort or routine medical care, such as pain relief, treatment of bleeding, or medicines used during miscarriage management when needed. These treatments do not treat total autosomal monosomy itself; they treat symptoms or complications around the pregnancy.
Genetic counseling is not a drug, but it is a key part of care after this result. It can help families understand what the finding means, how testing is confirmed, and why early symptoms of miscarriage may happen in affected pregnancies.
Genetic influences
For many families, total autosomal monosomy comes up in the setting of an early pregnancy loss, because an embryo usually cannot develop normally when one whole numbered chromosome is missing. It’s natural to ask whether total autosomal monosomy is inherited. In most cases, it is not passed down through families but happens as a random error when an egg or sperm is formed, or very soon after fertilization, so one autosome is missing in every cell. This is a chromosome problem rather than a single-gene condition, and losing all the genes on that chromosome is usually too severe to be compatible with life. Nothing a parent did during pregnancy causes it. If there have been repeated pregnancy losses, doctors may sometimes suggest chromosome testing for both parents and genetic counseling to better understand the chance of it happening again.
Is Total autosomal monosomy genetic?
Total autosomal monosomy is fundamentally genetic: it happens when one whole autosome is missing. It is usually caused by a random error very early in development, not by common inherited genetic variations.
Having a genetic risk is not necessarily a diagnosis
Changes in genes are a normal and common part of being human. Most do not directly affect health and simply reflect natural differences among people. For many genes, having a change linked to a condition suggests a possible connection rather than a certain diagnosis, especially when several genes and environmental factors are involved. In some cases, though, one well-understood change in a particular gene is enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For families affected by Total autosomal monosomy, treatment is usually guided more by the health problems that develop than by one standard medication plan. Because this condition involves a whole non-sex chromosome being missing, it changes many genes at once, and there is no drug that can replace that missing genetic material. Genetic test results can still be very important, because they help doctors see whether the chromosome change is present in all cells or only some cells, which can shape monitoring, supportive care, and choices about any medicines or procedures that may be needed. Not every difference in response is genetic, but for people living with Total autosomal monosomy, problems affecting organs, growth, or development can change which drugs are safest and what dose may fit best. In other words, how genetics affect treatment for Total autosomal monosomy is often less about finding a single targeted medicine and more about tailoring care to the body’s specific needs. Since complete Total autosomal monosomy is usually not compatible with life, care discussions may also include genetic counseling about outlook and future pregnancies.
Interactions with other conditions
For complete autosomal monosomy, the main medical reality is that it is almost always incompatible with ongoing life, so it usually does not have the kind of long-term overlap with other diseases seen in children or adults. Most pregnancies with total autosomal monosomy end very early, often before there are recognizable early symptoms of pregnancy problems beyond bleeding, cramping, or a miscarriage that seems to happen without a clear warning. If testing finds this chromosome change after a pregnancy loss, doctors may also check for other chromosome differences, placental problems, or maternal health conditions that could affect the pregnancy, but these are separate issues rather than diseases caused by the monosomy itself. Doctors call it a comorbidity when two conditions occur together, but in this case that question usually comes up around pregnancy care and genetic evaluation, not around lifelong disease interactions in someone living with the condition. For many families, the more relevant next step is discussing whether further testing, including review of family history or chromosome studies, might help clarify future pregnancy risks.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Total autosomal monosomy?
In practice, total autosomal monosomy is most often considered alongside other major chromosome problems that can also cause very early miscarriage or very serious problems before birth, especially trisomy, which means an extra chromosome, triploidy, which means a full extra set of chromosomes, and large missing or extra pieces of a chromosome. Similar findings can also happen when a parent carries a chromosome change that leaves the baby with too much or too little genetic material, so doctors usually use chromosome testing to tell these apart.
History
Long before modern chromosome testing, doctors and pathologists noticed that some pregnancies ended very early because the embryo could not continue to develop normally. Only later, when laboratory methods made it possible to count and examine chromosomes, did researchers begin to understand that total autosomal monosomy means a complete missing copy of one of the body’s non-sex chromosomes. This was an important shift, because it explained why this finding is usually seen in miscarriage tissue rather than in babies, children, or adults.
In the mid-20th century, early chromosome studies gave doctors their first clear view of these major chromosome changes. As testing improved, reports from pregnancy loss samples showed that complete loss of an autosome was one of the most severe chromosome imbalances. In recent decades, awareness has grown through better prenatal testing and more detailed laboratory analysis, which has helped families get a clearer explanation after an early pregnancy loss, even though this can still be very hard news to receive.
Over time, the history of total autosomal monosomy has been shaped less by bedside descriptions and more by advances in reproductive medicine, pathology, and genetics. Researchers later identified a genetic cause in general terms: the problem arises from a major chromosome error, usually occurring very early around conception. That history also explains why there is little discussion of long-term symptoms of total autosomal monosomy; for most pregnancies, the condition is not compatible with ongoing development. Today, this knowledge helps doctors give more accurate counseling, rule out other explanations, and place an unexpected test result in its proper medical context.