CPT (Certified Phlebotomy Technician) Practice Exam

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What color tube is commonly used for blood typing?

Green
Lavender
Red
Yellow

The correct answer is: Red

The color tube commonly used for blood typing is red. Red-top tubes do not contain any additives, which allows for the collection of serum. This is essential for blood typing procedures, as serum is needed to conduct various tests, including the determination of blood groups. Since red tubes facilitate the natural clotting process and provide serum free from anticoagulants, they are ideal for serological tests like blood typing. The use of red-top tubes ensures that the results are accurate and reliable. While other colors signify different additives suited for various tests, they may introduce substances that could interfere with the results of a typical blood typing test. This specificity of the red tube is what makes it the preferred choice for blood typing analyses.