- pH: Indicates the acidity or alkalinity of blood. - Partial pressure of oxygen (PaO2): Measures the oxygen level in the blood. - Partial pressure of carbon dioxide (PaCO2): Indicates the carbon dioxide level. - Bicarbonate (HCO3-): Reflects the metabolic component. - Oxygen saturation (SaO2): Represents the percentage of hemoglobin saturated with oxygen.