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Venous Blood Gas (VBG)

Venous Blood Gas (VBG) is a test to measure the levels of oxygen, carbon dioxide, and acid-base balance in the blood.

This test is typically done using a sample of blood from a vein, in contrast to an arterial blood gas (ABG) test that is done using an artery.

Parameters measured in a VBG include

  • pH,
  • partial pressure of oxygen (PaO2),
  • partial pressure of carbon dioxide (PaCO2),
  • bicarbonate (HCO3-),
  • oxygen saturation (SaO2),
  • and base excess (BE).

These parameters can provide information about the acid-base balance, the efficiency of gas exchange in the lungs, and the body's compensatory mechanisms.

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