What is the correct order of draw for blood collection?

The correct order of draw for blood collection is essential for ensuring that the results of various laboratory tests are accurate and free from contamination. The order of draw prevents cross-contamination between different additive tubes, which could interfere with test results.

The correct sequence begins with a tube that contains no additives, such as the red top tube. This is important because certain additives can interfere with tests that require serum samples. The blue top tube follows, which contains sodium citrate, an anticoagulant used primarily for coagulation studies. Next in line is the green top tube, which contains heparin, another anticoagulant, used for various tests. Finally, the lavender top tube is used, which contains EDTA, another anticoagulant, necessary for complete blood counts and other hematological tests.

This order is based on the types of additives in the tubes and their potential interactions, ensuring that the blood samples drawn for different tests maintain their integrity and yield accurate results. Understanding this order is critical for a phlebotomy technician to minimize the risk of contamination and ensure high-quality patient care.