Prab at 13:23, 18 March 2025

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'''Transudate''' is a type of fluid that passes through a membrane, which filters out much of the protein and cellular elements to yield a watery solution. It is typically composed of low protein content and is often clear in appearance. Transudate formation is a result of an imbalance in the [[hydrostatic pressure]] and [[osmotic pressure]], often due to diseases such as [[congestive heart failure]] and [[cirrhosis]].

==Definition==
A '''transudate''' is defined as a fluid with low protein content, specifically less than 2.5 g/dL, and a low [[lactate dehydrogenase]] (LDH) level. It is also characterized by a low white blood cell count. The fluid is often clear and has a specific gravity less than 1.012.

==Formation==
Transudate formation is primarily due to an imbalance in the hydrostatic and osmotic pressure within the body. This can occur due to a variety of diseases, including congestive heart failure, cirrhosis, and [[nephrotic syndrome]]. In these conditions, the increased hydrostatic pressure or decreased osmotic pressure in the blood vessels forces fluid into the interstitial space, resulting in the formation of a transudate.

==Clinical significance==
The presence of a transudate can indicate underlying medical conditions. For instance, in congestive heart failure, the increased hydrostatic pressure in the blood vessels forces fluid into the lungs, resulting in a pulmonary transudate. Similarly, in cirrhosis, the decreased osmotic pressure in the blood vessels can lead to the accumulation of a transudate in the abdominal cavity, a condition known as [[ascites]].

==Differential diagnosis==
In clinical practice, the nature of a fluid (whether it is a transudate or an [[exudate]]) can be determined using Light's criteria. According to these criteria, a fluid is considered an exudate if at least one of the following conditions is met:
* The ratio of fluid protein to serum protein is greater than 0.5.
* The ratio of fluid LDH to serum LDH is greater than 0.6.
* The fluid LDH is greater than two-thirds the upper limit of normal serum LDH.

If none of these conditions are met, the fluid is considered a transudate.

==See also==
* [[Exudate]]
* [[Hydrostatic pressure]]
* [[Osmotic pressure]]
* [[Congestive heart failure]]
* [[Cirrhosis]]
* [[Nephrotic syndrome]]
* [[Ascites]]
* [[Light's criteria]]

[[Category:Medical terminology]]
[[Category:Body fluids]]
[[Category:Symptoms and signs]]

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Transudate - Revision history

Prab at 13:23, 18 March 2025

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