Which blood test is usually performed in a red-top tube?

Study for the National Phlebotomy Certification Exam with multiple choice questions, flashcards, and explanations to improve your knowledge and boost your confidence. Get ready to ace your certification!

The blood test that is typically performed in a red-top tube is indeed associated with serum tests, including chemistry panels. Red-top tubes are designed to collect serum samples, as these tubes do not contain any additives that would interfere with the analysis of serum components.

When blood is drawn into a red-top tube, it is allowed to clot, and after centrifugation, the serum can be separated from the clot for testing. This makes red-top tubes particularly useful for a variety of chemistry tests, including metabolic panels and enzyme assays.

In contrast, other tests have specific requirements for tube types; for example, coagulation tests require blue-top tubes that contain sodium citrate as an anticoagulant, while complete blood counts are performed using lavender-top tubes that contain EDTA to preserve the cellular components. Blood cultures are usually taken in specific culture bottles that are designed to support the growth of microorganisms.

Thus, the correct association of the red-top tube with serum tests, including chemistry panels, reflects its use in laboratory practices.

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