Light's Criteria
Light's Criteria: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.
Light's Criteria
Serum proteing/L
Pleural fluid proteing/L
Serum LDHU/L
Pleural fluid LDHU/L
Upper limit of normal of serum LDHU/L
Light's criteria met
3
Effusion type
Exudate
Protein: pleural/serum
0.57
LDH: pleural/serum
0.72
More about: Light's Criteria
What it calculates
The “Light's Criteria” calculator computes Light's criteria met from 5 parameters: serum protein (g/L), pleural fluid protein (g/L), serum ldh (U/L), pleural fluid ldh (U/L), upper limit of normal of serum ldh (U/L).
Used by professionals and patients to assess health metrics, dosages, and risks.
Example calculation
With parameters Serum protein = 70 g/L, Pleural fluid protein = 40 g/L, Serum LDH = 250 U/L, Pleural fluid LDH = 180 U/L, Upper limit of normal of serum LDH = 250 U/L the result is 3.
How to use
- Enter serum protein, pleural fluid protein, serum ldh, pleural fluid ldh and upper limit of normal of serum ldh — each field above is adjustable with a slider.
- Light's criteria met is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.
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