NCLEX arterial blood gas interpretation
This NCLEX review set covers arterial blood gas interpretation, including normal values, acid-base balance, clinical implications, and nursing actions.
Quiz(64 questions)
1. What is the normal pH range for arterial blood?
Terms in this Study Set(64)
Normal Values and Ranges(16)
Normal pH range for arterial blood?
7.35 - 7.45. Indicates acid-base balance.
Normal PaCO2 range?
35 - 45 mmHg. Reflects respiratory function.
Normal PaO2 range?
75 - 100 mmHg. Indicates oxygenation status.
Normal HCO3- range?
22 - 26 mEq/L. Reflects metabolic status.
True or False: pH below 7.35 indicates alkalosis.
False. It indicates acidosis.
Fill in the blank: PaCO2 above 45 mmHg indicates _____
hypercapnia or respiratory acidosis.
Comparison: HCO3- vs. pH
HCO3- measures metabolic status; pH measures overall acid-base balance.
What does a PaO2 below 60 mmHg suggest?
Severe hypoxemia; requires immediate action.
What is the formula for calculating HCO3-?
No specific formula; measured directly from arterial blood sample.
Normal range for arterial oxygen saturation?
95% - 100%. Indicates effective oxygen transport.
True or False: A pH of 7.50 indicates acidosis.
False. It indicates alkalosis.
Cause → Effect: High HCO3-
Metabolic alkalosis; can result from vomiting.
What does an increased PaCO2 indicate?
Respiratory acidosis; may result from hypoventilation.
What is the significance of pH 7.4?
It is considered neutral; optimal for physiological functions.
Normal value for base excess?
-2 to +2 mEq/L. Indicates metabolic status.
What is the significance of HCO3- in ABG?
It reflects the metabolic component of acid-base balance.
Acid-Base Disorders(16)
Respiratory acidosis → definition
Condition where pH < 7.35, PaCO2 > 45 mmHg. Caused by hypoventilation or lung diseases.
Common causes of respiratory acidosis?
- COPD - Pneumonia - Sedative overdose - Respiratory muscle fatigue
Fill in the blank: pH of respiratory acidosis is ____
Less than 7.35
Respiratory alkalosis → definition
Condition where pH > 7.45, PaCO2 < 35 mmHg. Caused by hyperventilation.
What are signs of respiratory alkalosis?
Dizziness, tingling in fingers, palpitations, and seizures.
True or False: Metabolic acidosis has a pH > 7.45
False. Metabolic acidosis has a pH < 7.35.
Common causes of metabolic acidosis.
- Diabetic ketoacidosis - Renal failure - Lactic acidosis - Diarrhea
Metabolic alkalosis → definition
Condition where pH > 7.45, HCO3- > 28 mEq/L. Caused by loss of acid.
Signs of metabolic alkalosis?
- Muscle twitching - Confusion - Nausea - Decreased respiratory rate
Comparison: Respiratory vs. Metabolic acidosis
Respiratory acidosis: CO2 retention; Metabolic acidosis: HCO3- loss.
Cause → Effect: Hyperventilation → _____
Respiratory alkalosis
Formula for determining compensatory response.
For metabolic acidosis: 1.5 x HCO3- + 8 = expected PaCO2
Example: HCO3- of 20 mEq/L → expected PaCO2?
Expected PaCO2 = 1.5(20) + 8 = 38 mmHg.
What is compensation?
Physiological adjustments to restore pH balance. Example: Hyperventilation in metabolic acidosis.
Signs of compensatory mechanisms.
Increased respiratory rate, renal adjustments of HCO3-.
Fill in the blank: Metabolic alkalosis is often due to ____
Loss of acid or gain of bicarbonate.
Clinical Implications(16)
Respiratory acidosis → clinical implications?
Causes: Hypoventilation, airway obstruction. Implications: Monitor for confusion, lethargy, increased heart rate.
True or False: Metabolic alkalosis causes hypoventilation.
False. It usually causes hyperventilation as the body tries to compensate.
Normal PaCO2 range?
35-45 mmHg. Values outside this range indicate respiratory issues.
pH < 7.35 indicates what?
Acidosis. Nursing care may include monitoring vital signs, administering buffers.
Metabolic acidosis causes?
Causes: Diarrhea, renal failure, diabetic ketoacidosis. Implications: Assess for Kussmaul respirations.
Respiratory alkalosis → nursing actions?
Encourage slow breathing, provide reassurance, monitor for hypocalcemia.
PaO2 < 60 mmHg signifies?
Severe hypoxemia. Immediate oxygen therapy needed, assess for cyanosis.
Fill in the blank: HCO3- normal range is ____.
22-26 mEq/L. Values outside indicate metabolic issues.
Acidosis vs. alkalosis: main difference?
Acidosis: pH < 7.35; Alkalosis: pH > 7.45.
Cause of respiratory failure often seen?
COPD exacerbation, pneumonia. Monitor ABG for compensation.
Metabolic alkalosis signs?
Muscle cramps, tingling, arrhythmias. Assess electrolyte levels.
pH 7.32, PaCO2 50 mmHg: diagnosis?
Respiratory acidosis. Nursing interventions include improving ventilation.
What does combined acidosis indicate?
Both respiratory and metabolic disturbances. Complex care needed.
True or False: HCO3- > 26 suggests metabolic acidosis.
False. It suggests metabolic alkalosis.
Clinical significance of PaO2 80-100 mmHg?
Normal oxygenation. Continue monitoring; maintain airway patency.
Kussmaul respirations indicate?
Severe metabolic acidosis. Assess for diabetic complications.
Nursing Actions and Priorities(16)
Intervention for low pH (acidosis)?
Administer bicarbonate if metabolic acidosis; ensure adequate ventilation for respiratory acidosis.
True or False: High PaCO2 indicates respiratory alkalosis.
False. High PaCO2 indicates respiratory acidosis due to inadequate ventilation.
Action for high PaO2 levels?
Monitor for oxygen toxicity; reduce supplemental oxygen if necessary.
Fill in the blank: pH < 7.35 indicates __________.
acidosis.
Prioritize care for which ABG result?
Severe acidosis (pH < 7.2) requires immediate interventions to stabilize the patient.
Nursing action for metabolic alkalosis?
Assess for hypokalemia; may need to administer potassium and monitor vital signs.
What to monitor in respiratory alkalosis?
Monitor for signs of hypocalcemia and anxiety-related symptoms.
Cause of metabolic acidosis?
Diabetic ketoacidosis, renal failure, or lactic acidosis can lead to metabolic acidosis.
What action for patient with low HCO3-?
Initiate IV fluids; monitor electrolytes and adjust treatment based on underlying cause.
High PaCO2 + low pH = ?
Respiratory acidosis; focus on improving ventilation and airway management.
How to correct metabolic alkalosis?
Administer IV fluids, monitor electrolytes, and address the underlying cause.
Prioritize interventions for which ABG?
pH < 7.2 or > 7.6; these levels are critical and require urgent care.
True or False: Low PaO2 requires immediate oxygen therapy.
True. Low PaO2 (<60 mmHg) indicates oxygenation issues that need immediate attention.
What to assess for in high HCO3-?
Check for symptoms of metabolic alkalosis, such as muscle twitching and irritability.
Patient with respiratory acidosis exhibits ...?
Confusion, lethargy due to brain hypoxia; focus on airway clearance and ventilation support.
Intervention for patient with respiratory alkalosis?
Encourage slow, deep breaths; use a paper bag if needed to re-breathe CO2.
Questions in this Study Set(64)
1. What is the normal pH range for arterial blood?
2. What is a common cause of respiratory acidosis?
3. What is the primary characteristic of respiratory acidosis?
4. Which of the following is an appropriate nursing action for a patient experiencing metabolic acidosis?
5. Which of the following PaCO2 values indicates respiratory acidosis?
6. Which ABG finding indicates metabolic alkalosis?
7. Which of the following is NOT a common cause of respiratory acidosis?
8. A patient presents with a pH of 7.25. What should be the nurse's priority action?
9. What is the normal range for HCO3- in arterial blood?
10. Which of the following is NOT a sign of respiratory alkalosis?
11. Fill in the blank: The pH of metabolic acidosis is ____.
12. What nursing intervention is appropriate for a patient with respiratory alkalosis?
13. A patient has a PaO2 level of 55 mmHg. What does this indicate?
14. If a patient presents with a pH of 7.28 and elevated PaCO2, what is the likely diagnosis?
15. Signs of respiratory alkalosis include which of the following?
16. In which condition would you expect to see a high PaCO2 level?
17. True or False: A pH of 7.30 indicates alkalosis.
18. What does a HCO3- level of 29 mEq/L suggest?
19. In metabolic acidosis, which compensatory mechanism occurs?
20. The nurse assesses a patient with a pH of 7.48. What does this indicate?
21. Which HCO3- level suggests metabolic alkalosis?
22. Which factor most commonly leads to metabolic acidosis?
23. Which of the following conditions is a common cause of metabolic acidosis?
24. What is the primary cause of respiratory acidosis?
25. What does a PaCO2 value of 30 mmHg suggest?
26. In respiratory alkalosis, what compensatory mechanism is typically seen?
27. What happens during metabolic alkalosis?
28. Which of the following ABG results requires immediate nursing intervention?
29. Which of the following is NOT a normal range for arterial oxygen saturation?
30. Which of the following is a nursing priority for a patient with severe hypoxemia (PaO2 < 60 mmHg)?
31. Which of the following is a sign of metabolic alkalosis?
32. What nursing action should be taken for a patient with a low HCO3- level?
33. True or False: HCO3- is a measure of respiratory status.
34. What is the normal range for arterial blood pH?
35. What is the formula for calculating the expected PaCO2 in metabolic acidosis?
36. What condition is indicated by a pH of 7.60?
37. What is the significance of a pH of 7.4?
38. Which of the following symptoms is associated with metabolic alkalosis?
39. Which condition is a result of decreased kidney function leading to metabolic acidosis?
40. In patients with respiratory acidosis, what should the nurse monitor closely for?
41. What indicates hypercapnia in a patient?
42. Which condition is a common cause of respiratory failure?
43. In respiratory acidosis, which of the following occurs?
44. Which of the following is NOT a cause of metabolic alkalosis?
45. What is the normal base excess range?
46. What vital sign change might indicate respiratory acidosis?
47. True or False: Metabolic alkalosis is characterized by a pH < 7.35.
48. What is the best initial action for a nurse when a patient's ABG shows low oxygen saturation?
49. Which of the following conditions can result in a high HCO3- level?
50. What is the expected nursing action for a patient with Kussmaul respirations?
51. Fill in the blank: Hyperventilation leads to ____.
52. What nursing action is appropriate for a patient with high PaO2 levels?
53. What does an increased PaO2 indicate?
54. Which ABG finding indicates a respiratory alkalosis?
55. Which of the following indicates metabolic acidosis when comparing arterial blood gas values?
56. In metabolic acidosis, the nurse should assess for which electrolyte imbalance?
57. Which is the formula for calculating HCO3-?
58. A patient presents with a pH of 7.30, PaCO2 of 48 mmHg, and HCO3- of 24 mEq/L. What is the likely diagnosis?
59. Which of the following is NOT a compensatory response to metabolic acidosis?
60. The nurse recognizes which of the following as a compensatory response to respiratory acidosis?
61. Which of the following values for arterial blood pH would indicate acidosis?
62. Which of the following is NOT a nursing action for a patient experiencing respiratory acidosis?
63. What role does bicarbonate play in acid-base balance?
64. Which nursing action is a priority for a patient with a pH of 7.29?
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