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fio2 normal values

Interpretation of Arterial Blood Gases | Pocket ICU Management

First Things First

Step 1: Properly obtaining ABG sample

Values measured directly: PaCO2, PaO2, pH

Values calculated: HCO3-

PaO2 and PaCO2 must be corrected for temperature variations from the 37 degrees of the analyzer. Increased temperature decreases gas solubility and falsely increases the gas tensions. The opposite is true for lowering temperature.

Alveolar oxygen

I am now going to give you a very nice looking equation that is, sadly, an 'unsolvable' equation:

Alveolar O2 (PAO2) = Inspired Oxygen - Oxygen consumed

This equation makes sense - the amount of oxygen that is in the alveoli is determined by how much oxygen I take in minus the amount of oxygen consumed by my tissue. This equation, in fact, makes so much sense that clinically there are times you are going to need to solve the equation in order to figure out what is happening in the lungs. Afterall, x-rays and CAT scans tell me a lot about the structure of the lungs, but we can only infer what is happening functionally. Starting from this equation (and using readily available numbers relatively easy to get from even a very sick patient), you can begin to make some inferences about the pulmonary function. The following animation works through the same material that the text does.

Laboratory Tests Interpretation

Arterial Blood Gas Interpretation

(ABG) Arterial Blood Gas Analysis is used to measure the partial pressures of oxygen (PaO2), carbon dioxide (PaCO2), and the pH of an arterial blood sample. Oxygen content (O2CT), oxygen saturation (SaO2), and bicarbonate (HCO3-) values are also measured. A blood sample for ABG analysis may be drawn by percutaneous arterial puncture from an arterial line.

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