billycalc

Maddrey's DF

Maddrey's DF: 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.

Maddrey's DF

Patient prothrombin times
Control prothrombin times
Total bilirubinµmol/L
Maddrey's discriminant function
24.2
Bilirubin is converted to mg/dL (÷17.1)Maddrey's DF: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
Prognosis
Non-severe hepatitis

More about: Maddrey's DF

What it calculates

The “Maddrey's DF” calculator computes Maddrey's discriminant function from 3 parameters: patient prothrombin time (s), control prothrombin time (s), total bilirubin (µmol/L).

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters Patient prothrombin time = 16 s, Control prothrombin time = 12 s, Total bilirubin = 100 µmol/L the result is 24.2 (Bilirubin is converted to mg/dL (÷17.1)).

How to use

  1. Enter patient prothrombin time, control prothrombin time and total bilirubin — each field above is adjustable with a slider.
  2. Maddrey's discriminant function is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. 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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