# Pleural effusions: seeing transudate–exudate differentiation in a different light

## TL;DR

This paper discusses a new approach to differentiate between transudate and exudate pleural effusions, which is important for accurate diagnosis.

## Contribution

The paper introduces a 'triple combination' test that simplifies the diagnostic process without needing simultaneous serum sampling.

## Key findings

- The 'triple combination' test performs similarly to Light's criteria in diagnosing pleural effusions.
- The test eliminates the need for simultaneous serum sampling, streamlining the diagnostic process.

## Abstract

Pleural effusions are a common medical presentation, with an estimated incidence of 337 per 100 000 of the population [1]. The causes of pleural effusion are diverse and making an accurate diagnosis is therefore paramount. A typical first step in the evaluation of patients with pleural effusion is to differentiate the effusion as a transudate or exudate [2]. Transudates are a result of systemic factors leading to increased capillary hydrostatic pressure or reduced oncotic pressure, while exudates reflect an inflamed pleura with causes including malignancy, infection and autoimmune conditions.

The “triple combination” test developed by Porcel and colleagues avoids the need for simultaneous serum sampling and has similar diagnostic performance characteristics to Light's criteria
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