High PH value indicates alkalosis. The normal PH value of human body is between 7.35 and 7.45, PH value less than 7.35 indicates acidosis, PH value more than 7.45 indicates alkalosis. Alkalosis is divided into metabolic alkalosis and respiratory alkalosis. The one caused by the primary increase of bicarbonate is called metabolic alkalosis, and the one caused by the primary decrease of partial pressure of carbon dioxide is called respiratory alkalosis. Metabolic alkalosis is usually seen due to loss of gastric juice, such as nausea and vomiting or pyloric obstruction resulting in a large loss of gastric juice, and low potassium and low chloride alkalosis, which may also be caused by potassium deficiency or by bicarbonate accumulation. Respiratory alkalosis is usually seen with accelerated respiration, which is caused by excessive carbon dioxide excretion after alveolar hyperventilation.