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Diagnostic Tests


The patient's blood is put into different colored tubes, each with its own additive depending on the test being performed:

* A purple-top tube is used for a complete blood count (CBC). A CBC measures:

1. The adequacy of your red blood cells, to see if you are anemic
2. The number and type of white blood cells (WBCs), to determine the presence of infection
3. A platelet count (platelets are a blood component necessary for clotting)

* A red-top tube is used to test the serum (the liquid or non-cellular half of your blood).

* A blue-top tube is used to test your blood's clotting.