Final answer:
The reference range for CO2 in arterial blood is 35-48 mm Hg for males and 32-45 mm Hg for females. Critical values for CO2 can vary and should be consulted with a medical professional or specific laboratory guidelines.
Step-by-step explanation:
The reference range for CO2, also known as carbon dioxide, can vary depending on the type of measurement and the source. In arterial blood, the reference range for pCO2, the partial pressure of CO2, is 35-48 mm Hg for males and 32-45 mm Hg for females. For total venous bicarbonate, the reference range is 22-29 mM.
Critical values for CO2, which indicate levels outside the normal range that may require immediate medical attention, can also vary depending on the laboratory and guidelines. It's best to consult with a medical professional or refer to specific laboratory guidelines for the critical values of CO2.