Difficulty: Hard

Average Score: 36%

When a serum separation tube (SST) is collected, which of the following actions should the phlebotomist take to ensure optimal test results?

Rationale

Invert the tube 5 to 8 times and then set for 30 min prior to centrifugation.

To obtain optimal test results from a serum separation tube (SST), it is essential to properly mix the sample by inverting the tube 5 to 8 times and allowing it to stand for 30 minutes before centrifugation. This process ensures adequate clot formation and separation of serum from the cellular components.

A (Invert the tube 5 to 8 times and then set for 30 min prior to centrifugation.) CORRECT

This choice is correct as it follows the recommended protocol for SSTs, allowing the clot to form adequately and ensuring efficient separation of serum during centrifugation.

B (Invert the tube 1 to 3 times and then set for 1 hr prior to centrifugation.) YOUR ANSWER

This option is incorrect because inverting the tube only 1 to 3 times does not provide enough mixing to ensure proper clotting. Additionally, waiting for 1 hour is longer than necessary, which could lead to degradation of the sample.

C (Invert the tube 2 to 4 times and then set for 15 min prior to centrifugation.) YOUR ANSWER

While inverting the tube 2 to 4 times is somewhat effective, it falls short of the recommended 5 to 8 inversions. Moreover, a 15-minute waiting period is insufficient for proper clot formation, potentially compromising test results.

D (Invert the tube 8 to 10 times and then set for 2 hr prior to centrifugation.) YOUR ANSWER

This choice involves excessive inversions and an unnecessarily long waiting time of 2 hours. While the number of inversions may be acceptable, the extended time could lead to sample instability and altered test results.

Conclusion

Proper handling of serum separation tubes is crucial for achieving accurate laboratory results. The recommended procedure of inverting the SST 5 to 8 times and allowing it to rest for 30 minutes before centrifugation optimizes clot formation and serum separation. Deviations from this protocol may jeopardize the integrity of the sample and impact diagnostic outcomes.

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