The lung volume is the amount of air that our lungs can contain. It is divided into several parts. The first is the tidal volume, which is the amount of air we normally inhale and exhale. The second is the reserve volume, which is the amount of air we can inhale or exhale in addition to the tidal volume, if we try. The third is the residual volume, which is the amount of air that always remains in the lungs to keep them open. Together they form the total lung volume. This can vary depending on age, gender, height, and physical condition. A reduction in lung volume may indicate lung diseases such as asthma, bronchitis or emphysema.

LTP is an acronym for "long term prophylaxis". It involves patients with HAE (Hereditary Angioedema) regularly receiving medication to prevent swelling attacks.

Local treatment means treatment at the site where the disease occurs. An example of local treatment is applying medicinal ointment to the focus of inflamed skin.

Local glucocorticoids are medicines from the group of glucocorticoids in the form of creams, ointments, solutions, which are applied directly to the focus of diseased skin.

Local antibiotic therapy is a treatment method in which the antibiotic is in the form of a cream or ointment and is applied directly to the area where the skin is diseased.

Lymphocytes are a type of white blood cells or leukocytes. They are part of the immune system. We know two types of lymphocytes (B lymphocytes and T lymphocytes). Besides defending against harmful microorganisms, lymphocytes are also important in the development of inflammatory diseases (e.g. in atopic dermatitis).

Lichenification is a term used to describe a thickened, rough area of skin, which is most often the result of chronic scratching of inflamed foci. Lichenified foci are a common occurrence on the skin of patients with atopic dermatitis.

A lesion is a term used to describe an abnormal change on the skin or in the body.

Leukocytes are cells that are found in our blood and are also referred to as white blood cells. They are part of the immune system. Leukocytes include neutrophils, lymphocytes, monocytes, eosinophils, basophils. Each of the aforementioned cells has an important function in defending the human body against harmful microorganisms or modified own cells.

Lactose intolerance is quite a common problem, in which the body cannot digest lactose. Lactose is a type of sugar that is found in milk and dairy products. The cause of lactose intolerance is usually due to a lack of the enzyme lactase, which helps to digest lactose. Because of this, digestive problems can occur (abdominal pain, diarrhea, bloating). Some people can manage lactose intolerance by limiting the consumption of dairy products or by taking dietary supplements that contain the enzyme lactase.