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Light's Criteria Calculator for Pleural Effusion
Classify pleural fluid as Exudate or Transudate using Light's criteria
Pulmonology Guidelines: Light's criteria classifies pleural effusions. A pleural effusion is classified as an Exudate if it meets any one of the following criteria: (1) Pleural Protein / Serum Protein > 0.5, (2) Pleural LDH / Serum LDH > 0.6, or (3) Pleural LDH > 2/3 of the upper limit of normal serum LDH. Enter lab values below.
Pleural Fluid & Serum Lab Values Input
Calculation Results
⚠️ Not medical advice. For pulmonology, clinical laboratory medicine, and reference only. Pleural effusion evaluation, thoracentesis interpretation, and underlying diagnosis must be supervised strictly by a qualified physician or pulmonologist.