Phlebotomy Technician Practice Exam (NCPT/CPT)

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What is the correct order of draw when using a wing tip needle for tests such as CBC, PTT, and Chemistry Panel?

  1. Light blue, Lavender, SST

  2. SST, Lavender, Light blue

  3. Light blue, SST, Lavender

  4. Lavender, SST, Light blue

The correct answer is: Light blue, Lavender, SST

The correct order of draw when using a wing tip needle for tests such as CBC, PTT, and Chemistry Panel is light blue, lavender, then SST. This is because the light blue tube is used for coagulation tests such as PTT, the lavender tube is used for hematology tests such as CBC, and the SST (serum separator tube) is used for chemistry tests. The other options are incorrect because they do not follow the proper order of draw for these specific tests. For example, option B starts with SST which would contaminate the lavender and light blue tubes with anticoagulants or additives, affecting the accuracy of the test results. Similarly, option D starts with lavender which could contaminate the following SST tube. Option C starts with light blue, which would contaminate the following SST and lavender tubes. Therefore, it is important to follow the

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