What is the correct last tube to collect in the recommended order of draw?

The correct last tube to collect in the recommended order of draw is the glycolytic inhibitor tube, which is typically gray. This is because the gray tube contains additives that help preserve glucose levels in the sample, preventing glycolysis from skewing test results.

In the recommended order of draw, it's essential to prevent cross-contamination of additives from one tube to another, which can affect the accuracy of test results. The gray tube is specifically designed to inhibit glycolysis, meaning it is crucial to collect it last to ensure that any other additives from previously collected tubes do not interfere with its performance.

By collecting the gray tube last, you help maintain the integrity of the sample, particularly important in tests that measure glucose and lactate levels. This order of draw protocol is essential for obtaining valid laboratory results and ensuring the reliability of patient care.