What is the primary function of the lavender top tube?

The primary function of the lavender top tube is to collect samples for hematology tests. This type of tube typically contains EDTA (ethylenediaminetetraacetic acid), which acts as an anticoagulant by binding calcium in the blood. This property is essential for preventing clotting, thereby allowing accurate measurement of blood cell components such as red blood cells, white blood cells, and platelets.

Hematology tests, such as complete blood counts (CBC), require whole blood that has not clotted, making the lavender top tube an essential component in obtaining reliable and precise results in these tests. Other tubes, such as those with different colored tops, serve different purposes, such as measuring glucose levels or coagulation studies, but the lavender top tube is specifically designed for hematology testing.