Which type of laboratory is associated with lavender tubes?

• A. Biochemistry
• B. Microbiology
• C. Hematology
• D. Toxicology

Answer: (C)

Lavender tubes are specifically used for hematology tests. The main additive in these tubes is EDTA (ethylenediaminetetraacetic acid), which is an anticoagulant that helps preserve blood samples for later analysis by preventing clotting. This is especially important for tests such as a complete blood count (CBC), which evaluates various components of the blood, including red and white blood cells and platelets. The use of lavender tubes ensures that the sample remains in a liquid state and is stable for accurate testing, making them essential in hematology laboratories.

In contrast, biochemistry tests often utilize other colored tubes, such as gold or red, which contain different additives suited for serum collection and separation. Microbiology tests typically require sterile containers, while toxicology tests can vary widely in tube color depending on the specific assays being performed. Thus, the association of lavender tubes with hematology is based on their specific design and function in preserving whole blood samples for essential blood tests.