Why measure pO2 ? When should pO2 be measured ? The amount of oxygen in blood is managed by many variables, e.g. ventilation/perfusion. O2 is the partial strain of oxygen in a gas section in equilibrium with the blood. The remaining 98 - ninety nine % of oxygen current in blood is sure to the hemoglobin within the erythrocytes. O2 primarily displays the oxygen uptake in the lungs. Life is determined by the continuous provide of oxygen to tissue cells, which in flip relies on the continuous oxygenation of venous blood within the lungs. Oxygen diffuses down a stress gradient from a comparatively high level (21.2 kPa (159 mmHg) at sea level) in inspired air, to progressively lower levels in the respiratory tract, the alveolar gasoline, the arterial blood, capillaries and finally the cell/mitochondria, the place the bottom pO2 level (1 - 1.5 kPa (7.5 - 11.5 mmHg)) is noticed. Although pO2 represents only a really small fraction of the whole oxygen (ctO2) (see ctO2) being transported in arterial blood, it is extremely vital as it is the most important determinant of the quantity of oxygen sure to hemoglobin (see sO2) and thereby the entire quantity of oxygen transported by arterial blood and made available to tissue cells.
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