LDH Exudate vs Transudate Light's Criteria Calculator

Classify pleural effusion as exudate or transudate using Light's criteria: pleural/serum LDH ratio, absolute LDH, and protein ratio.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Classify pleural effusion as exudate or transudate using Light's criteria: pleural/serum LDH ratio, absolute LDH, and protein ratio

Each component has a specific meaning:

  • Light's criteria: pleural/serum LDH ratio — The light's criteria: pleural/serum ldh ratio recorded for the scenario being assessed.
  • Absolute LDH — The absolute ldh recorded for the scenario being assessed.
  • Protein ratio — The protein ratio recorded for the scenario being assessed.

Note: Interpret the light's criteria result against the thresholds and context described above.

How to Use

Enter the Light's criteria: pleural/serum LDH ratio, absolute LDH, protein ratio for the scenario you are assessing. Classify pleural effusion as exudate or transudate using Light's criteria: pleural/serum LDH ratio, absolute LDH, and protein ratio. Use the light's criteria result to inform your calculation.

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Frequently Asked Questions