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CNBC CCN (CCN) Practice Tests & Test Prep by Exam Edge

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CNBC Certified Clinical Nutritionist Sample Test

1 of 5

Which of the following is NOT true of mixing tubes?

Correct Answer:

vigorous inversion and mixing is essential.

when handling mixing tubes in medical procedures, understanding the correct method of inversion and mixing is crucial. one common misconception is that vigorous inversion and mixing of these tubes is necessary. however, this statement is not accurate and therefore not true of mixing tubes. vigorous mixing can actually be detrimental as it may lead to hemolysis, which is the rupture of red blood cells. hemolysis can compromise the integrity of the sample, rendering it unusable for certain tests.

instead of vigorous shaking, a gentle inversion technique is recommended. typically, tubes should be inverted gently between three to eight times, depending on the type of additive in the tube. this gentle inversion helps to mix the sample with the additive without causing damage to the cells.

if the tubes are not mixed adequately, another issue that can arise is the formation of microclots. these clots can interfere with the diagnostic accuracy of the tests performed on the sample. therefore, it is essential to mix the tubes promptly and adequately, albeit gently, to prevent clotting while avoiding hemolysis.

in summary, while it is critical to mix the contents of the tubes thoroughly to avoid issues like microclot formation, the method of doing so should not be vigorous. instead, a careful and gentle inversion is necessary to maintain the sample's integrity for accurate test results.