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Calcimator

Coagulation Panel Calculator

Interpret coagulation panel results (PT, INR, PTT, fibrinogen, platelets) to assess bleeding risk and clotting status.

Inputs

seconds
seconds
mg/dL
x10³/µL

Results

Bleeding Risk

1 (1=Low, 2=Moderate, 3=High)

Abnormal Values

0 parameters

PT Status1 (1=Normal, 2=Elevated)
INR Status2 (1=Low, 2=Normal, 3=Therapeutic, 4=High)
PTT Status1 (1=Normal, 2=Elevated)
How to Use This Calculator
  1. Enter PT (prothrombin time in seconds) and the laboratory's normal mean PT to calculate INR.
  2. Input aPTT (activated partial thromboplastin time in seconds) and the laboratory reference range.
  3. Enter fibrinogen level (mg/dL) if available.
  4. Review INR, aPTT ratio, and fibrinogen interpretation for bleeding or clotting risk.
  5. Monitor trends over serial draws for patients on anticoagulation therapy.

What each input means

Prothrombin Time (PT)
Prothrombin time in seconds (normal 11-13.5 seconds).
INR
International Normalized Ratio (normal 0.9-1.1; therapeutic on warfarin 2-3).
Partial Thromboplastin Time (PTT)
Activated partial thromboplastin time (normal 25-35 seconds).
Fibrinogen
Fibrinogen level (normal 200-400 mg/dL).
Platelet Count
Platelet count in thousands per microliter (normal 150-400).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Prothrombin Time (PT) = 12.5, INR = 1, Partial Thromboplastin Time (PTT) = 30, Fibrinogen = 300 = 5 input(s) provided
  2. Calculate Bleeding Risk
    Bleeding Risk
    1 = 1
  3. Calculate Abnormal Values
    Abnormal Values
    0 = 0
  4. Calculate PT Status
    PT Status
    1 = 1
  5. Calculate INR Status
    INR Status
    2 = 2

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