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Calcimator

Blood Gas Interpreter Calculator

Interpret arterial blood gas (ABG) results to determine acid-base status, compensation level, and oxygenation adequacy.

Inputs

mmHg
mmHg
mEq/L
mEq/L

Results

Acid-Base Status

1 (1=Normal, 2=Resp Acidosis, 3=Resp Alkalosis, 4=Met Acidosis, 5=Met Alkalosis, 6=Mixed)

Compensation

1 (1=Uncompensated, 2=Partial, 3=Full)

Oxygenation1 (1=Normal, 2=Mild Hypoxemia, 3=Moderate, 4=Severe)
How to Use This Calculator
  1. Enter arterial blood gas values: pH, PaCO2 (mmHg), HCO3 (mEq/L), and PaO2 (mmHg).
  2. Input FiO2 (fraction of inspired oxygen) to calculate the A-a gradient.
  3. Review the primary disorder classification (respiratory vs. metabolic, acidosis vs. alkalosis).
  4. Check for compensation: expected compensation ranges are calculated automatically.
  5. Use the interpretation notes to guide clinical correlation and management decisions.

What each input means

pH (x100)
Enter pH x100 (e.g., 740 for 7.40). Normal range: 7.35-7.45.
pCO2
Partial pressure of carbon dioxide (normal 35-45 mmHg).
pO2
Partial pressure of oxygen (normal 80-100 mmHg on room air).
HCO3-
Bicarbonate level (normal 22-26 mEq/L).
Base Excess
Base excess/deficit (normal -2 to +2 mEq/L).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    pH (x100) = 740, pCO2 = 40, pO2 = 95, HCO3- = 24 = 5 input(s) provided
  2. Calculate Acid-Base Status
    Acid-Base Status
    1 = 1
  3. Calculate Compensation
    Compensation
    1 = 1
  4. Calculate Oxygenation
    Oxygenation
    1 = 1

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