CPT (Certified Phlebotomy Technician) Practice Exam 2025 - Free Certified Phlebotomy Technician Practice Questions and Study Guide

Question: 1 / 400

What color tubes contain SST?

Green

Lavender

Red/Tiger Top

The presence of Serum Separator Tubes (SST) is commonly associated with red/tiger top tubes. SST tubes are designed to separate serum from the blood cells following centrifugation due to their gel additive that forms a barrier. This separation is crucial for many laboratory tests as it ensures that serum is collected without contamination from cellular components.

In contrast, the other tube colors mentioned have specific uses and additives that differ from SST tubes. Green tubes typically contain heparin as an anticoagulant, lavender tubes contain EDTA for complete blood counts and other hematological tests, and blue tubes are often used for coagulation studies and contain sodium citrate as an anticoagulant. None of these tubes provide the same serum separation feature associated with SST tubes, making the red/tiger top option the correct answer.

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Blue

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