DIAG 2735 8a - Blood Chemistry Testing

DIAG 2735 8a - Blood Chemistry Testing - Blood Chemistry...

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Blood Chemistry Testing Blood Chemistry Testing Arterial Blood Gasses Electrolytes Metabolites Enzymes Carbohydrates Lipids Other
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Purpose of Testing Blood Gasses Purpose of Testing Blood Gasses page 24 page 24 To evaluate the ability of the lungs to oxygenate the blood, and ventilate wastes Kidney function Ability of the blood to carry oxygen
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Arterial Blood Gasses Arterial Blood Gasses pH = 7.35 to 7.45 PaCO 2 = 35-45mm Hg PaO 2 = 80-100mm Hg SaO 2 = 94-100% HCO 3- = 22-26 mEq/L O 2 CT = 15-23% Total Carbon Dioxide = 22-26 mEq/L
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pH = 7.35 to 7.45 pH = 7.35 to 7.45 pH measures the blood hydrogen ion concentration It is expressed as negative log 10 -2 is a pH of 2 10 -3 is a pH of 3 pH 2 is more acidic than pH 3 because there are 10x the number of hydrogen ions Blood must stay within a very tight range
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PaCO PaCO 2 2 Measures the partial pressure of CO 2 This is arterial blood so it should be low If this level elevates the blood is not ventilating properly
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PaO PaO 2 2 This is the partial pressure of O 2 in blood This level should be much higher in arterial (oxygenated) blood This measures the ability of the lung to oxygenate the blood
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SaO SaO 2 2 This is the oxygen saturation level of the blood It is expressed as a percentage of the carrying capacity of blood if all hemoglobin was saturated
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HCO HCO 3- 3- The bicarbonate ion is crucial in maintenance of blood pH The concentration of bicarbonate is regulated by the kidneys
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O O 2 2 CT CT Measures the actual amount of oxygen in blood Not often used in testing
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Abnormal Values Abnormal Values Low PaO 2 with O 2 CT and SaO 2 with high PaCO 2 Indicates not getting oxygen into the lungs either by muscle weakness, airway obstruction, or respiratory center inhibition
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Abnormal Values Abnormal Values PaO 2 , O 2 CT, and SaO 2 decrease, with PaCO 2 normal Indicates insufficient oxygenation of the
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DIAG 2735 8a - Blood Chemistry Testing - Blood Chemistry...

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