Accepted
at 1:58 p.m. Oct, 01, 2025
by
schralp
Author:
schralp
Type of change:
Other
Rationale for change
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"Exudative has extra stuff" - LDH, protein - due to increased microvascular permeability and cell destruction


| Light's Criteria | ||
| Transudative pleural effusion | Exudative pleural effusion | |
|---|---|---|
| Protein (pleural / serum) | ≤ 0.5 | > 0.5 |
| LDH (pleural / serum) | ≤ 0.6 | > 0.6 |
| Common causes | - Cirrhosis (low albumin) - Nephrotic syndrome (low albumin) - Congestive heart failure | - Infection (TB, fungal, empyema, parapneumonic) - Malignancy - Pulmonary embolism |


Photo Credit: James Heilman, MD, CC BY 3.0, via Wikimedia Commons, modified by cropping
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