Question 30

A collection tube may lose its vacuum because the expiration date has passed.

A collection tube can lose its vacuum when the expiration date has passed, as the integrity of the tube can be compromised over time, leading to a loss of vacuum.

A) The expiration date has passed

This option is correct because once a collection tube reaches its expiration date, the materials that create the vacuum may degrade, resulting in a loss of vacuum. This can affect the tube's ability to draw blood properly during the collection process.

B) The additive is adhering to the tube stopper

This option is incorrect. While additives can sometimes become dislodged, their adherence to the stopper does not directly cause the loss of vacuum. The vacuum is primarily dependent on the integrity of the tube and its seal rather than the state of the additive.

C) The tube was stored at room temperature

This option is also incorrect. Storing a collection tube at room temperature does not necessarily lead to a loss of vacuum, as many tubes are designed to be stable at room temperature until their expiration date. However, extreme temperatures may affect the tube's performance, but this is not a standard cause for losing vacuum.

D) The tube was underfilled with blood

This option is incorrect as well. Underfilling a tube may affect the sample quality and analysis but does not cause the tube itself to lose its vacuum. The vacuum is independent of the amount of blood collected in the tube.

Conclusion

The correct answer is definitively A, as the expiration date directly affects the integrity of the vacuum within the collection tube. Other options either misrepresent the causes of vacuum loss or focus on factors that do not influence the vacuum seal. Understanding the role of expiration dates is crucial for ensuring proper blood collection procedures.