Final answer:
The third tube to be drawn is the Lavender tube. Different colored tubes are used to collect different types of blood samples. The Lavender tube contains an anticoagulant called ethylenediaminetetraacetic acid (EDTA) to prevent the blood from clotting.
Step-by-step explanation:
The third tube to be drawn is the Lavender tube.
In healthcare settings, different colored tubes are used to collect different types of blood samples. The type of tube used depends on the tests that need to be performed. The Lavender tube is typically used for collecting blood samples for hematology tests, such as complete blood count (CBC) and blood cell differentials.
For example, the Lavender tube contains an anticoagulant called ethylenediaminetetraacetic acid (EDTA) to prevent the blood from clotting. This allows for accurate testing of the blood cells and their components.