What does antithrombin deficiency mean?

With antithrombin deficiency, there is either too little of this protein in the blood, or the antithrombin does not work properly. This can be inherited, meaning it is caused by a genetic change. Sometimes the deficiency develops later in life, for example due to certain liver conditions, serious infections, or during pregnancy.

Antithrombin deficiency means the blood clots more easily than it should. The natural brake is missing or too weak. This raises the risk of developing thromboses. These are blood clots that most often form in the deep veins of the legs. If such a clot travels to the lungs, it can cause a pulmonary embolism, which is a serious and sometimes life-threatening situation.

Symptoms and possible consequences

Many people with antithrombin deficiency do not notice anything at first. Problems often only appear when a blood clot actually forms. Typical signs of a thrombosis include pain, swelling, and a bluish discolouration of the affected leg. With a pulmonary embolism, sudden breathlessness, chest pain, and a racing heart can occur.

Important to know: not everyone with antithrombin deficiency will develop a thrombosis during their lifetime. However, the risk is significantly raised, especially in situations that encourage clot formation, such as after surgery, during long periods of bed rest, during pregnancy, or when taking certain medicines.

How is antithrombin deficiency diagnosed?

Suspicion of antithrombin deficiency often arises when thromboses occur repeatedly or when similar cases are already known within the family. The diagnosis is made through a blood test. This measures how much antithrombin is present in the blood and whether it is working correctly.

In some cases, further tests are needed to find out whether the deficiency is inherited or acquired. Other clotting disorders are often investigated at the same time, to better assess the individual's personal risk.

Is antithrombin deficiency dangerous?

The diagnosis can feel unsettling, because the word "deficiency" can quickly cause worry. For many people, it is reassuring to know that antithrombin deficiency does not necessarily have to lead to serious problems. However, the risk of thrombosis is raised, and this should be taken seriously.

Extra care is especially important before planned surgery, during long journeys, or during pregnancy. In these situations, it may be sensible to take preventive medicines that slow down blood clotting. This decision is always made by a doctor after careful consideration.

Treatment and what you can do yourself

Treatment depends on how severe the deficiency is and whether thromboses have already occurred. Often it is enough to be aware of the personal risk and to follow certain precautions. In particular situations, such as surgery or childbirth, medicines like heparin are sometimes given to slow down clotting.

In cases of severe or repeatedly occurring deficiency, it may be necessary to replace the missing antithrombin through infusions. This is rare, however. In most cases, prevention is the main focus.

People who know they have antithrombin deficiency can do several things themselves: staying active in daily life, avoiding sitting or standing for long periods, drinking enough fluids, and wearing compression stockings on long journeys all help to reduce the risk of thrombosis. Smoking also increases the risk of blood clots and should be stopped if at all possible.

When should testing for antithrombin deficiency take place?

Testing makes sense if thromboses occur at a young age, if there are known cases of antithrombin deficiency or repeated thromboses in the family, or if thromboses develop in unusual parts of the body. Repeated miscarriages can also be a reason to consider a clotting disorder as a possible cause.

If antithrombin deficiency is found, it is advisable for close relatives to be tested as well. This means risks can be identified early and preventive measures can be put in place.

Living with antithrombin deficiency

Knowing about one's own condition can significantly reduce the risk of complications. Many people with antithrombin deficiency live without major limitations. What matters most is knowing the typical warning signs of a thrombosis or pulmonary embolism and seeking medical advice promptly if in any doubt.

Regular check-ups and an awareness of risky situations help to avoid problems. People who are well informed can usually go about their daily lives without worry and protect themselves in a targeted way.