Certified Clinical Medical Assistant Exam Practice Question
Which of the following tubes comes first in the order of draw?
Correct Answer: D
Rationale: In the order of draw for blood collection, the red-speckled stopper tube is drawn first to prevent contamination of the sample with additives from other tubes. This tube typically contains no additives, making it ideal for serum tests.
The gray stopper tube (A) is used for glucose and lactate testing and should be drawn after the red tube to avoid interference. The green-speckled stopper tube (B) contains heparin, which can affect certain tests if drawn too early. Lastly, the lavender stopper tube (C) contains EDTA, an anticoagulant that must be collected after the red tube to maintain sample integrity.
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