Arterial blood gases don’t just tell us whether a patient is in acidosis or alkalosis — they also reveal how well the body is fighting to restore balance. In this lesson, we’ll break down the difference between compensated, partially compensated, and uncompensated ABGs, using the Tic-Tac-Toe method to make interpretation clear and simple. With real-world examples like DKA, COPD, and combined acidosis, you’ll learn how to recognize when the body is correcting itself, when it’s only partially effective, and when no compensation is occurring. By the end, you’ll have a step-by-step framework to confidently interpret ABG results and connect them to patient conditions.
**Don’t forget to can re-print the PDF’s attached to this lesson so you can retest your knowledge as much as necessary!
Video Timestamps:
0:32 – Understanding “compensation” in ABGs
1:16 – Example of compensation in DKA (Kussmaul respirations)
2:08 – Overview of compensated, partially compensated, and uncompensated states
2:16 – Fully Compensated ABG explained: pH normal but systems balancing each other
2:51 – Example of compensated respiratory acidosis using Tic-Tac-Toe board
4:42 – Partially Compensated ABG explained: pH abnormal but moving toward normal
5:23 – Example of partially compensated metabolic acidosis (DKA with hyperventilation)
6:23 – Uncompensated ABG explained: pH abnormal and no corrective response yet
6:35 – Example 1: Uncompensated metabolic acidosis (CO₂ normal, bicarb low)
7:25 – Example 2: Combined acidosis (pH, CO₂, and HCO₃ all abnormal)
8:11 – Conclusion: Differentiating compensated, partially compensated, and uncompensated ABGs