As transudate in the are medicine by epithelia passing and from vessels exiting not flammable related body fluids , respectively. The process of secreting such fluids is called transudation . They must be distinguished from exudates caused by inflammation, for example . Transudates occur in healthy and diseased body processes.
Transudates are comparatively poor in cells and usually contain only flaked mesothelial cells and a few leukocytes . The protein content is low and is usually less than 30 g / l. The specific weight is less than 1.012. Transudates are usually clear, possibly with a light yellow color.
Physiologically , transudates appear as secretions from epithelia . Here they form a fine film of liquid, so only small amounts of liquid are involved. Such transudates are, for example, the vaginal secretion or the liquid film on the tunica serosa .
Possible causes of pathological transudates are:
- Insufficient water-binding capacity of the blood as a result of a lack of blood proteins ( albumin ), called hypalbuminemia , for example in cirrhosis of the liver (hepatic hydrothorax) or nephrotic syndrome and the resulting drop in colloid osmotic pressure .
- Congestion (for example in the case of heart failure , often bilateral, or pulmonary embolism ) and the associated increase in pressure in the bloodstream or the lymph vessels
- Rare causes are myxedema and sarcoid
- Berthold Jany, Tobias Welte: Pleural effusion in adults - causes, diagnosis and therapy. In: Deutsches Ärzteblatt. Volume 116, Issue 21, (May) 2019, pp. 377-385.
- Berthold Jany, Tobias Welte: Pleural effusion of adults. 2019, p. 379 f.