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Basic Questions ::

    There are three critical questions to keep in mind when attempting to interpret arterial blood gases (ABGs).

    First Question: Does the patient exhibit acidosis or alkalosis?
    Second Question: What is the primary problem? Metabolic? or Respiratory?
    Third Question: Is the patient exhibiting a comensatory state?

    These essential questions will guide you while you analyze ABGs.

    In order to understand ABG analysis and remember what is abnormal, we would be wise to review what is normal.
    Therefore, lets look at some normal range values and definitions

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