A client, confused and short of breath, is brought to the emergency department by a family member. The medical history reveals chronic bronchitis and hypertension. To learn more about the client's current respiratory problem, the physician orders a chest X-ray and arterial blood gas (ABG) analysis. When reviewing the ABG report, the nurse sees many abbreviations. What does a lowercase "a" in an ABG value represent?

Carbonic acid is formed by the combination of:

A) water and bicarbonate. B) water and hemoglobin. C) lactate and pyruvic acid. D) water and carbon dioxide.

ICD-10-PCS is an acronym for:

A. International Classification of Diagnoses, Tenth Revision, Performance Coding System. B. International Classification of Diseases, Tenth Revision, Process Coding System. C. International Classification of Diseases, Tenth Revision, Procedure Coding System. D. International Classification of Diagnoses, Tenth Revision, Practice Coding System.