Difficulty: Easy

Average Score: 80%

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.

Proper handling of a serum separation tube (SST) is crucial for obtaining accurate test results, as it ensures thorough mixing of the blood with the gel separator and allows adequate clotting time. Inverting the tube 5 to 8 times promotes optimal serum separation while waiting for the appropriate duration before centrifugation.

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

This option correctly outlines the recommended procedure for handling an SST. Inverting the tube 5 to 8 times ensures that the blood and gel are mixed effectively, while the 30-minute waiting period allows for proper clot formation, resulting in clear serum separation during centrifugation.

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

This choice does not provide sufficient mixing of the blood with the gel separator, as inverting only 1 to 3 times may lead to incomplete separation. Additionally, a 1-hour wait is longer than necessary, which could potentially compromise the integrity of the sample.

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

While this option includes a reasonable inversion count, the 2 to 4 times does not ensure optimal mixing. Furthermore, the 15-minute wait is shorter than the recommended time, which may not allow adequate clot formation, affecting the quality of the serum.

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

Inverting the tube 8 to 10 times is excessive and may cause hemolysis of the sample due to over-mixing. Moreover, a 2-hour waiting period is unnecessarily long, which may lead to degradation of analytes and affect test results negatively.

Conclusion

Following proper protocol for handling serum separation tubes is essential for accurate laboratory results. Inverting the tube 5 to 8 times and allowing a 30-minute clotting period ensures optimal mixing and separation of serum. The other options either fail to provide adequate mixing or involve improper waiting times, which could compromise sample integrity and the reliability of test results.

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