What is the normal level of carbon dioxide (CO2) in the blood?

The normal level of carbon dioxide (CO2) in the blood is best represented by a range of 22-26 mEq/L. This range reflects the expected bicarbonate concentration in the arterial blood, which is one of the primary forms in which CO2 is carried in the body. This bicarbonate level is part of the body's mechanism for regulating acid-base balance and is crucial for maintaining homeostasis.

When evaluating a patient's acid-base status, healthcare professionals look at the bicarbonate levels in conjunction with other parameters, such as arterial blood gases (ABGs), to assess respiratory and metabolic function. Maintaining CO2 levels within this range is essential for ensuring that the body's pH remains within a normal range, thus allowing for optimal physiological function. Values outside this range could indicate respiratory or metabolic disturbances, leading to conditions such as acidosis or alkalosis.