Uses of Purple Top Tubes:
- Complete Blood Count (CBC): One of the most common tests performed with blood from a purple top tube is a CBC. This test gives information about the number and types of cells in the blood, including red blood cells, white blood cells, and platelets.
- Blood Smears: This is often done in conjunction with a CBC. A small drop of blood is spread thinly onto a microscope slide and is examined under a microscope. It provides valuable information about the shape and form of blood cells.
- Hemoglobin Electrophoresis: This test is used to diagnose different types of anemia, specifically those related to abnormal hemoglobin structures like sickle cell anemia.
- Flow Cytometry: This is a more specialized test that analyzes the characteristics of cells in the blood.
- HLA Typing: This test is often used in transplant medicine to match donors and recipients.
EDTA as an Anticoagulant:
- EDTA works by binding to calcium in the blood, preventing the blood from clotting.
- Since it preserves the shape of cells, it is ideal for tests that require microscopic examination.
- However, it’s essential not to overfill or underfill the tube as this might alter the blood-to-anticoagulant ratio, potentially leading to erroneous results.



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