Lights Criteria Calculator
Result
Lights Criteria Calculator — free online calculator.
Formula
- Lights Criteria Calculator calculates its result from Pleural protein, Serum protein, Pleural LDH, Serum LDH, Serum LDH ULN. It uses the formula Light criteria: protein ratio >0.5, LDH ratio >0.6, or pleural LDH >2/3 supplied serum ULN.. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Pleural protein, Serum protein, Pleural LDH, Serum LDH, Serum LDH ULN. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Lights Criteria
- Pleural protein: 3
- Serum protein: 6
- Pleural LDH: 200
- Serum LDH: 300
- Serum LDH ULN: 250
Using Pleural protein = 3, Serum protein = 6, Pleural LDH = 200, Serum LDH = 300, Serum LDH ULN = 250, the calculated result is Protein ratio: 0.5 | LDH ratio: 0.6666666667 | LDH/ULN: 0.8 | Exudate: Yes.
Sample result: Calculating…
Frequently asked questions
What does the Lights Criteria calculate?
Lights Criteria Calculator — free online calculator.
Which values should I enter?
Enter Pleural protein, Serum protein, Pleural LDH, Serum LDH, Serum LDH ULN using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Light criteria: protein ratio >0.5, LDH ratio >0.6, or pleural LDH >2/3 supplied serum ULN..
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.