Final answer:
The correct procedure after collecting an ammonia specimen is to place the specimen tube in an ice water slurry to prevent enzymatic activity from affecting the ammonia levels.
Step-by-step explanation:
After collecting an ammonia specimen, the proper procedure is to place the specimen tube in an ice water slurry. This is because ammonia levels in blood can increase rapidly due to enzymatic activity if the sample is kept at room temperature. Immediately placing the specimen tube in an ice water slurry helps to slow down enzymatic processes and stabilizes the ammonia concentration within the specimen, ensuring accurate measurement when the sample is analyzed.