Phlebotomy Technician Practice Exam (NCPT/CPT)

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How many times should SST collection tubes be inverted to ensure mixing?

  1. 3 times

  2. 5 times

  3. 7 times

  4. 10 times

The correct answer is: 5 times

SST collection tubes should be inverted 5 times in order to ensure proper mixing of the blood sample and the additive. Inverting the tube too few or too many times may result in improper mixing, which can affect the accuracy of test results. Inverting the tube 3 times (option A) may not be enough to evenly distribute the additive, while inverting the tube 7 or 10 times (options C and D) may lead to over-mixing and potential hemolysis of the sample.

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