Blood gas

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Blood gas is a laboratory test of blood where the purpose is primarily to measure ventilation and oxygenation. The source is generally noted by an added word to the beginning; arterial blood gases come from arteries, venous blood gases come from veins and capillary blood gases come from capillaries.[1]

Values measured[edit]

  • pH — The acidity or basicity of the blood.
  • PaCO2 — The partial pressure of carbon dioxide in the blood.
  • PaO2 — The partial pressure of oxygen in the blood.
  • HCO3 — The level of bicarbonate in the blood.
  • BE — The base-excess of bicarbonate in the blood.

Purposes for testing[edit]

Abnormal results[edit]

Abnormal results may be due to lung, kidney, or metabolic diseases. Head or neck injuries or other injuries that affect breathing can also lead to abnormal results.[1]


  1. ^ a b c d e f g h Seifter JL. Acid-base disorders. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 119

External Link[edit]

Blood Gas Interpretation - Simplified process for blood gas interpretation.