Difficulty: Medium

Average Score: 52%

A phlebotomist should identify that which of the following is an example of why a collection tube would lose its vacuum

Rationale

The expiration date has passed.

A collection tube loses its vacuum primarily when the expiration date has passed, as the materials can degrade over time, leading to a compromised seal. This loss of vacuum impacts the tube's ability to draw the necessary blood volume effectively.

A (The expiration date has passed) CORRECT

When a collection tube is used past its expiration date, the integrity of the vacuum seal may be compromised due to the degradation of the materials involved in the tube's construction. This can result in a loss of vacuum, making it ineffective for blood collection, as it may not generate the necessary suction to draw blood properly.

B (The additive is adhering to the tube stopper) YOUR ANSWER

While additives are crucial for blood sample preservation, their adherence to the tube stopper does not affect the vacuum itself. Additives are designed to mix with the blood once collected, and their presence on the stopper would not result in a loss of vacuum prior to use, thus not being a reason for vacuum failure.

C (The tube was stored at room temperature) YOUR ANSWER

Storing the tube at room temperature is typically acceptable for most collection tubes, provided they are within the specified conditions. This does not inherently lead to a vacuum loss, as the vacuum seal is maintained under standard storage conditions, making this option irrelevant to the question.

D (The tube was underfilled with blood) YOUR ANSWER

Underfilling a tube with blood does not affect the vacuum present in the tube at the time of collection. The vacuum is established prior to use and remains until the tube is filled; therefore, underfilling does not contribute to a loss of vacuum.

Conclusion

Understanding the factors that can lead to a loss of vacuum in collection tubes is essential for phlebotomists. The expiration date is a crucial aspect, as using expired tubes may compromise their effectiveness. Other options listed do not contribute to vacuum loss, emphasizing the importance of adhering to storage recommendations and expiration dates to ensure proper blood collection procedures.

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