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ABGs (pH, CO₂, HCO₃⁻) | 마이메르시 MyMerci
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ABGs (pH, CO₂, HCO₃⁻)

NCLEX Review Guide: Fluid, Electrolyte & Acid-Base Balance - ABGs

Arterial Blood Gas (ABG) Analysis

Normal ABG Values

  • pH: 7.35-7.45 - Measures hydrogen ion concentration; values below 7.35 indicate acidosis, above 7.45 indicate alkalosis
  • PaCO₂: 35-45 mmHg - Reflects respiratory function; elevated levels indicate respiratory acidosis, decreased levels indicate respiratory alkalosis
  • HCO₃⁻: 22-26 mEq/L - Indicates metabolic status; low levels suggest metabolic acidosis, high levels suggest metabolic alkalosis
  • PaO₂: 80-100 mmHg - Measures oxygenation status; values below 80 mmHg indicate hypoxemia requiring intervention

Memory Aid: ROME

Respiratory Opposite - pH and CO₂ move in opposite directions

Metabolic Equal - pH and HCO₃⁻ move in the same direction

Key Points

  • Always assess pH first to determine acidosis vs alkalosis
  • Determine primary disorder by identifying which system (respiratory or metabolic) matches the pH
  • Look for compensation - opposite system attempts to normalize pH

ABG Interpretation Steps

  1. Step 1: Assess the pH - Is it acidic (<7.35) or alkalotic (>7.45)?
  2. Step 2: Determine primary disorder - Does CO₂ or HCO₃⁻ match the pH direction?
  3. Step 3: Check for compensation - Is the opposite system moving to normalize pH?
  4. Step 4: Assess oxygenation status using PaO₂ values

Quick Reference: Primary Disorders

DisorderpHPrimary ChangeCompensation
Respiratory Acidosis↓CO₂ ↑HCO₃⁻ ↑
Respiratory Alkalosis↑CO₂ ↓HCO₃⁻ ↓
Metabolic Acidosis↓HCO₃⁻ ↓CO₂ ↓
Metabolic Alkalosis↑HCO₃⁻ ↑CO₂ ↑

Clinical Scenarios & Nursing Interventions

Scenario 1: COPD Patient

ABG Results: pH 7.32, CO₂ 58, HCO₃⁻ 28

Interpretation: Respiratory acidosis with metabolic compensation

Nursing Actions: Monitor respiratory status, encourage deep breathing, position for optimal ventilation

Scenario 2: Diabetic Ketoacidosis

ABG Results: pH 7.25, CO₂ 30, HCO₃⁻ 15

Interpretation: Metabolic acidosis with respiratory compensation

Nursing Actions: Monitor for Kussmaul respirations, assess blood glucose, prepare for insulin therapy

Critical Alert: pH <7.20 or >7.60 requires immediate intervention

Common Pitfalls & Study Tips

Frequently Confused Concepts

  • Compensation vs Correction: Compensation never fully normalizes pH, while correction returns pH to normal range
  • Acute vs Chronic: Chronic conditions show better compensation than acute disorders
  • Mixed Disorders: Both respiratory and metabolic abnormalities present simultaneously

Memory Aid: TICS

Tired = CO₂ retention (respiratory acidosis)

Irritable = Low CO₂ (respiratory alkalosis)

Confused = Metabolic acidosis

Seizures = Severe alkalosis

Quick Check Questions

  • □ Can you identify the primary disorder from pH and matching parameter?
  • □ Do you understand the difference between partial and full compensation?
  • □ Can you recognize when immediate intervention is needed?
  • □ Do you know the clinical manifestations of each acid-base disorder?

Remember: Mastering ABG interpretation takes practice, but with consistent study and understanding of the systematic approach, you'll confidently tackle these NCLEX questions. You've got this! 🌟

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