Advanced Light Criteria Calculator | Pleural Effusion Medical Tool

Advanced Light's Criteria Calculator

Classify pleural effusions as exudates or transudates using pleural fluid and serum biomarker ratios.

1. Pleural Fluid Protein (g/dL)

2. Serum Protein (g/dL)

3. Pleural Fluid LDH (U/L)

4. Serum LDH (U/L)

5. Serum LDH Upper Limit of Normal (U/L)

Fluid Classification: Awaiting Input

Pleural/Serum Protein Ratio: 0.00 (Negative)

Pleural/Serum LDH Ratio: 0.00 (Negative)

Pleural LDH > 2/3 Normal Limit: 0 U/L (Negative)

Parameter	Transudate	Exudate
Fluid / Serum Protein Ratio	≤ 0.5	> 0.5
Fluid / Serum LDH Ratio	≤ 0.6	> 0.6
Fluid LDH vs. Upper Normal Limit	≤ 2/3 of upper limit	> 2/3 of upper limit
Primary Mechanisms	Increased hydrostatic or decreased oncotic pressure	Increased capillary permeability or lymphatic blockade
Common Clinical Etiologies	Congestive heart failure, cirrhosis, nephrotic syndrome	Pneumonia, malignancy, pulmonary embolism, TB

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