CPFT Practice Exam 2025 – Complete Test Prep Guide

Sodium hydroxide is often referred to by the alternative name sodalime or sodasorb in the context of pulmonary function testing (PFT) machines. Sodalime is a chemical compound primarily composed of sodium hydroxide and calcium oxide, and it acts as a carbon dioxide absorber in various respiratory applications, including in PFT equipment. It plays a crucial role in maintaining accurate measurements of respiratory gases by removing CO2 from the gas stream. This helps ensure that the analysis of the respiratory gases is accurate and reliable.

The other options listed, while related to chemical compounds and laboratory processes, do not serve the same purpose as sodium hydroxide in PFT machines. They are not used as alternatives for sodium hydroxide in the context of gas absorption in pulmonary function testing. Understanding the role of particular compounds in this setting is critical for accurate PFT results and reflects the importance of using the right materials in pulmonary diagnostics.