Question 18

Placing the specimen in ice

To ensure the accuracy of arterial blood gas (ABG) analysis, it is crucial to place the specimen in ice immediately after collection. This action helps preserve the sample integrity by slowing down metabolic processes that could alter the gas levels.

A) Collecting the specimen in an SST

Collecting the specimen in a serum separator tube (SST) is not appropriate for ABG analysis. An SST is designed for serum collection and may not maintain the necessary conditions for accurate gas measurements, thus compromising the results.

B) Placing the specimen in ice

Placing the specimen in ice is the correct action as it helps maintain the temperature and slows the metabolic activity of the cells in the blood, thereby preserving the sample for accurate analysis of gases like oxygen and carbon dioxide.

C) Collecting the specimen in sodium citrate

Using sodium citrate as an additive is not suitable for ABG specimens. Sodium citrate is an anticoagulant used primarily for coagulation studies and can interfere with the analysis of gases, leading to inaccurate results.

D) Inserting the specimen in a light-resistant package

While protecting the specimen from light can be important for certain tests, it is not a critical factor for ABG analysis. This action does not address the primary need to preserve the sample's metabolic state, which is more effectively achieved by placing it on ice.

Conclusion

Placing the specimen in ice is critical for maintaining the integrity of arterial blood gas samples, ensuring accurate results. Other options, such as using an SST, sodium citrate, or merely using a light-resistant package, do not adequately preserve the sample for the specific needs of ABG analysis, highlighting the importance of proper specimen handling.