Metabolic Acidosis
A bicarbonate (HCO3) level less than 22 mEq/L, with a pH less than 7.35; caused by a deficit of base in the bloodstream, or an excess of acids (other than CO2).
Symptoms
Cardiovascular Dysrhythmias, flushed skin
Gastrointestinal Nausea, vomitting
Neurological Confusion, headache, lethargy, coma
Pulmonary Kussmaul's respirations

Arterial blood gas example: Compensated Metabolic Acidosis: if PaCO2 indicates alkalosis, and HCO3 indicates acidosis, and pH is normal, but less than 7.4.