Question 49

A green-top tube for ammonia testing that is being shipped in an icy water mixture

The specimen that a phlebotomist has appropriately prepared for transport is a green-top tube for ammonia testing that is being shipped in an icy water mixture. This method is critical for preserving the integrity of ammonia, which can degrade quickly at room temperature.

A) A red-top tube that is being shipped after clotting for 15 min and being centrifuged

This option is incorrect as it does not specify the appropriate temperature for transport. While the red-top tube is prepared correctly by allowing clotting and centrifugation, it is crucial to ensure that the specimen is transported under conditions that prevent degradation, which is not addressed here.

B) A tube containing serum that is being shipped after separation from a lavender-top tube

This choice is also incorrect. Although separating serum from a lavender-top tube is a necessary step, it does not provide information about the conditions or medium in which the serum is being shipped. Without proper temperature control, the stability of the serum may be compromised.

C) A tiger-top tube for bilirubin testing that is being shipped in a clear biohazard bag

This option is not suitable because, while the tiger-top tube is often used for bilirubin testing, it is essential to shield bilirubin from light exposure. Shipping it in a clear biohazard bag does not protect it from light, which can lead to inaccurate test results.

D) A green-top tube for ammonia testing that is being shipped in an icy water mixture

This option is correct as ammonia is very sensitive to temperature changes. Shipping the green-top tube in an icy water mixture helps maintain the correct temperature, which is vital for preserving the sample's integrity until it reaches the testing facility.

Conclusion

The correct answer is option D, as it highlights the proper preparation and transport conditions necessary for ammonia testing, which is crucial for accurate results. Other options fail to meet the necessary requirements for specimen integrity, either neglecting temperature control or failing to protect the specimen from environmental factors that could compromise its quality.