Arterial Blood pH Calculator

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Measured serum or plasma bicarbonate from the arterial blood gas report. Normal range: 22-26 mEq/L.
mEq/L
Partial pressure of carbon dioxide in arterial blood. Normal range: 35-45 mmHg.
mmHg
Serum sodium, used to calculate the anion gap. Normal range: 136-145 mEq/L.
mEq/L
Serum chloride, used to calculate the anion gap. Normal range: 98-106 mEq/L.
mEq/L
Serum albumin used to correct the anion gap for hypoalbuminemia. Normal: 3.5-5.0 g/dL. Leave at 4.4 if not available.
g/dL
Arterial Blood pHNormal pH
7.401

Calculated from the Henderson-Hasselbalch equation

pH StatusNormal (7.35 - 7.45)
Primary DisorderNormal
Compensation PhaseNone required
Anion Gap12mEq/L
Corrected Anion Gap12mEq/L
7.401 pH
Severe Acidosis<7.2Acidosis7.2-7.35Normal7.35-7.45Alkalosis7.45-7.6Severe Alkalosis7.6+

Arterial pH 7.401: within normal limits.

  • Calculated arterial pH is 7.401 (within the normal range of 7.35-7.45).
  • All three ABG parameters are within their normal reference ranges.
  • Anion gap is 12.0 mEq/L (normal; normal 8-12 mEq/L).

Next stepCross-check this result with a full arterial blood gas panel including PaO2, base excess, and lactate for a complete clinical picture.

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