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Light's Criteria is a diagnostic tool used to determine if pleural fluid is exudative. This is crucial for identifying the underlying cause of pleural effusions, which can range from malignancy to infections.
In addition to its diagnostic value, pleural fluid analysis also has predictive value (ie, estimates of the likelihood of a clinical response to pleural fluid drainage) and prognostic value (eg, likelihood of disease recurrence or progression in malignant pleural effusion).
Differentiation of exudate and transudate fluid. Aims to identify local from systemic illness. Common causes can then be actively sought and treated; Use Light’s criteria is moderately sensitive for differentiation, further tests are then required to further define the exudate; Pleural fluid from thoracocentesis
Light's criteria encompass three parameters: pleural fluid protein levels, serum-to-pleural fluid ratio, and pleural fluid LDH levels (see Table 2 below). These criteria serve as...
The first step in the evaluation of patients with pleural effusion is to determine whether the effusion is a transudate or an exudate. An exudative effusion is diagnosed if the patient...
Light’s criteria. Light’s criteria are more accurate for the diagnosis of exudative effusions. The fluid is considered an exudate if any of the following are present: The ratio of pleural fluid to serum protein is greater than 0.5; The ratio of pleural fluid to serum LDH is greater than 0.6
This Light's criteria calculator allows you to determine the type of pleural fluid - transudate vs exudate - with just a few basic laboratory parameters.