Normal venous blood pH ranges from:
A. 6.8 to 7.2
B. 7.31 to 7.41
C. 7.35 to 7.45
D. 7.0 to 8.0
Correct Answer: B. 7.31 to 7.41
Normal venous blood pH ranges from 7.31 to 7.41. Normal arterial blood pH ranges from 7.35 to 7.45. Blood gas analysis is a commonly used diagnostic tool to evaluate the partial pressures of gas in blood and acid-base content. Understanding and use of blood gas analysis enable providers to interpret respiratory, circulatory, and metabolic disorders.
Option A: A “blood gas analysis” can be performed on blood obtained from anywhere in the circulatory system (artery, vein, or capillary). An arterial blood gas (ABG) tests explicitly blood taken from an artery.
Option C: ABG analysis assesses a patient’s partial pressure of oxygen (PaO2) and carbon dioxide (PaCO2). PaO2 provides information on the oxygenation status, and PaCO2 offers information on the ventilation status (chronic or acute respiratory failure).
Option D: PaCO2 is affected by hyperventilation (rapid or deep breathing), hypoventilation (slow or shallow breathing), and acid-base status. Although oxygenation and ventilation can be assessed non-invasively via pulse oximetry and end-tidal carbon dioxide monitoring, respectively, ABG analysis is the standard.
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