A healthy result should fall into the range 2.2 - 13.2 ug/L.

Also Known As Mast Cell Tryptase Alpha Tryptase Beta Tryptase Mature Tryptase

Tryptase is an enzyme that is released, along with histamine and other chemicals, from mast cells when they are activated as part of a normal immune response as well as in allergic (hypersensitivity) responses. This test measures the amount of tryptase in the blood.

Mast cells are large tissue cells found throughout the body. They are present in highest amounts in the skin, the lining of the intestine and air passages, and the bone marrow. They contain granules that store a number of chemicals, including tryptase and histamine. When mast cells are activated, they release their contents. If a person has too many mast cells (mastocytosis) and/or the cells are activated inappropriately, the chemicals that are released (especially histamine) may cause symptoms that range from moderate to life-threatening.

Normally, the level of tryptase in the blood is very low. When mast cells are activated, the level increases rapidly, rising within 15 to 30 minutes, peaking at 1 to 2 hours, and returning to normal after several hours to a couple of days. In people with severe allergies, activation of many mast cells can cause an extreme form of allergic reaction known as anaphylaxis, which can cause low blood pressure, hives (blisters on the skin), severe narrowing of the air passages, and even death. Tryptase levels will be very high in people with anaphylaxis.

In some cases, tryptase levels will be high in persons with mast cell activation disorders, in which mast cells become activated without apparent allergies or other reasons.

Tryptase levels can also be significantly and persistently increased with mastocytosis, a rare group of disorders associated with an abnormal increase in the number of mast cells. These cells may accumulate in the skin (cutaneous mastocytosis) or in organs throughout the body (systemic mastocytosis).

While cutaneous mastocytosis typically only causes skin problems (particularly hives), people with systemic mastocytosis or a mast cell activation disorder may experience anaphylaxis and its associated symptoms. These symptoms may be persistent and are related to the organs affected by mast cell accumulation. Systemic mastocytosis may progress slowly or may be aggressive, causing organ dysfunction and, in rare cases, causing a form of leukemia.

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