Take the Blood Count Quiz

The last time you visited your healthcare provider for an illness, he or she might have ordered a CBC test to help figure out the diagnosis. CBC stands for complete blood count, but what does that mean? And what do all those numbers on the result sheet mean? Find out by taking this quiz, based on information from the National Institutes of Health.

1. Which blood cells and blood elements are included in a CBC test?
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Each type of blood cell or element—platelets are fragments of blood cells—plays an important role in how your body works, so all 3 types are studied in a CBC test. Besides these 3 types of cells, blood is also made up of plasma. Plasma is a clear yellow liquid filled with proteins, nutrients, and other substances. Blood cells make up about 45% of your blood. Plasma makes up the rest.