Most common etiologies for BLOODY pleural effision: Trauma Malignancy Pulmonary infarct Post-cardiac injury Lights Criteria: one criteria = EXUDATIVE effusion Pleural total protein / serum total protein > 0.5 Pleural LDH / serum LDH > 0.6 Pleural LDH ≥ 2/3 ULN for serum LDH * Lights criteria is SENSITIVE, but NOT SPECIFIC – you do not … Continue reading AM Report 3/22/17: Pleural Effusion