Lymphocytosis

The lymphocytosis (or lymphocytosis ) is a finding of the blood examination, by an increased lymphocyte is characterized speed. It is therefore a special case of leukocytosis . A distinction is made between absolute and relative lymphocytoses. In the first case, the total number is increased (normally around 1,000–4,800 / µl blood ), in the second case only the percentage of lymphocytes in the leukocytes in the so-called differential blood count (around 16–45%) is too high, which is also the case with one relative reduction of the myeloid cell series.

The main causes of isolated lymphocytosis are viral infections ( lymphocytosis infectiosa acuta ) and diseases of the blood-forming organs ( acute lymphocytic leukemia , chronic lymphocytic leukemia ). Lymphocytosis also occurs as a late reaction in inflammation and in chronic infectious diseases and chronic allergies. In children or young animals, lymphocytosis is physiological.

In a broader sense, this can also be used to describe an increase in the number of lymphocytes in other body fluids (e.g. in the cerebrospinal fluid ).

Individual evidence

1. ↑ Gotthard Schettler, Heiner Greten (Ed.): Internal medicine. Understand, learn, apply . 9th edition. Thieme Verlag, Stuttgart 1998, ISBN 3-13-552209-1 .
2. ↑ Ludwig Heilmeyer , Herbert Begemann: Blood and blood diseases. In: Ludwig Heilmeyer (ed.): Textbook of internal medicine. Springer-Verlag, Berlin / Göttingen / Heidelberg 1955; 2nd edition ibid. 1961, pp. 376–449, here: p. 423.

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