What are the pH values of venous blood and arterial blood?

Under normal circumstances, the pH values of venous blood and arterial blood range from 7.35 to 7.45. The specific analysis is as follows:

pH value is the most direct indicator for assessing acid-base balance disturbances in the body, generally referring to the ratio of bicarbonate to carbonic acid. The pH values of both venous and arterial blood fall within the range of 7.35–7.45 and are influenced by factors such as respiration and metabolism. The human body can tolerate a pH range of 6.8 to 7.8. If the pH exceeds 7.45, it may indicate an excess of alkaline substances in the body, leading to uncompensated alkalosis that exceeds the body's regulatory capacity. If the pH is below 7.35, it may suggest an excess of acidic substances, indicating uncompensated acidosis beyond the body's ability to compensate. When the pH falls between 7.35 and 7.45, three possibilities exist: normal acid-base balance, compensated acid-base imbalance, or mixed-type acid-base disturbance. Venous and arterial blood pH values are typically measured through blood gas analysis.

When undergoing blood gas analysis, it is recommended to avoid strenuous exercise and emotional fluctuations to prevent interference with test results.