Which tube color is eleventh in the order of draw?

• A. Lavender
• B. Royal blue with lavender stripe
• C. Gray
• D. Yellow

Answer: (B)

The correct tube color that is eleventh in the order of draw is the royal blue tube with a lavender stripe. This tube is specifically used for trace metal analysis, particularly when evaluating elements such as lead and mercury in blood samples. The order of draw is essential in phlebotomy to minimize the risk of contamination from additive carryover between tubes, which can compromise test results.

In this case, the royal blue tube with a lavender stripe has specific additives that aid in accurate trace element testing, making it imperative that it follows certain tubes filled with other additives in the draw sequence. The order ensures that the results are reliable, adhering to established protocols within laboratory practices. Other tube options, while relevant in various contexts, do not hold this specific place in the sequence needed for this accurate testing.