What does transudation mean?
Transudation is the movement of fluid through a membrane or the wall of a blood vessel, usually into surrounding tissues or a body cavity. The term is especially important in medicine and physiology. A transudate is typically clear or slightly cloudy and contains relatively little protein, unlike an exudate, which commonly forms when inflammation increases vessel permeability. Transudation can result from differences in pressure within the circulatory system, changes in osmotic balance, or abnormalities in fluid regulation. It is associated with findings such as edema, pleural effusion, and ascites, although the underlying cause can vary. The word is formal and technical rather than conversational, but it precisely describes a passive movement of fluid that differs from active inflammatory leakage.
nounThe process of passing fluid through a membrane or the walls of a blood vessel, especially into surrounding tissues or body cavities. In medicine, it usually refers to the movement of a relatively clear, low-protein fluid called a transudate.
- The process of passing fluid through a membrane or blood-vessel wall into surrounding tissues or a body cavity.
- The formation or movement of a transudate, typically a clear, low-protein fluid caused by differences in hydrostatic or osmotic pressure.
"The transudation of fluid through the capillary walls became more pronounced as pressure increased."
"The transudation of fluid across the membrane was visible as a gradual accumulation beneath the skin."
"Severe edema can result from transudation of plasma fluid into the tissues."
The plural is uncommon; the process is usually expressed with the uncountable singular.
"Severe transudations were observed after the patient's fluid-balance levels changed."
Transudation is the body's quiet leak, driven largely by pressure and fluid-balance imbalances rather than inflammation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of transudation
The word comes from Latin transudare, meaning “to sweat through,” formed from trans-, “through,” and sudare, “to sweat.” The English noun transudation developed from this Latin terminology and was established in the early modern period. The same Latin root appears in related words such as sudation, sudorific, and exudation.
Related word forms
How transudation is actually used
This is a formal, chiefly medical and physiological term. It is more precise than general words such as “leakage” because it specifies the passage of fluid through a membrane or vessel wall; in clinical use, it is often distinguished from inflammatory exudation.
Easily confused with transudation
Transudation is generally the movement of low-protein fluid driven by pressure or osmotic imbalance, whereas exudation is associated with inflammation and increased vessel permeability, often producing protein-rich fluid.