NAVTA Practice Test

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Prepare for the NAVTA Test with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

Practice this question and more.

A red top tube, once spun, will result in ____.

Plasma.
Platelets.
Whole blood.
Serum.

The correct answer is: Serum.

When a red top tube is spun, the blood cells in it are separated from the plasma, which is the liquid portion of the blood. This separation allows for the clear yellow serum to collect at the top of the tube. Despite the choice of plasma, platelets, and whole blood, the only substance that can be produced from spinning a red top tube is serum. Platelets are a type of blood cell and cannot be produced by spinning the tube. Whole blood, on the other hand, refers to the mixture of all blood components, including red and white blood cells, platelets, and plasma, and cannot be a direct result of spinning a red top tube.