Clinical Medical Assistant Exam Practice Question
Which tube in a multiple-tube collection is typically drawn last?
Correct Answer: C
Rationale: In multiple-tube collections, the serum tube is typically drawn last to prevent contamination from additives in other tubes. The EDTA tube (A) and citrate tube (B) contain anticoagulants that can interfere with serum tests if drawn first. Blood culture tubes (D) are drawn first to avoid contamination from skin flora, ensuring accurate microbial growth results. Drawing the serum tube last minimizes the risk of cross-contamination, allowing for the most reliable serum sample for biochemical analyses.
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