Chloride is an electrolyte regulated by the kidneys and adrenal glands.Source : <a href="http://www.drmagrann.com/A%26P/13%20Renal%20Clearance.pptCommon">http://www.drmagrann.com/A%26P/13%20Renal%20Clearance.pptCommon</a> Laboratory Tests - Stritch School of Medicine PPTPresentation Summary : Common Laboratory Tests Carbon Dioxide Content The carbon dioxide content (CO2) measures the H2CO3, dissolved CO2 and bicarbonate ion (HCO3) that exists in the serum.Source : http://ww