Which of the following is the order of draw for the evacuated tube method of venipuncture

Rationale

Red, green, lavender, gray is the correct order of draw for the evacuated tube method of venipuncture.

The order of draw is crucial in venipuncture to prevent cross-contamination of additives between different tubes, which can affect test results. The specified order ensures that samples are collected in a manner that preserves their integrity for accurate analysis.

A (Red, green, lavender, gray) CORRECT

This choice represents the correct order of draw according to established guidelines. The red tube is collected first to avoid contamination from additives in other tubes, followed by green, lavender, and gray tubes in sequence, which helps maintain the accuracy of laboratory results.

B (Red, lavender, gray, green) YOUR ANSWER

This option incorrectly places the green tube after the gray tube. The green tube contains heparin, which can interfere with tests performed on samples collected in lavender or gray tubes, leading to inaccurate results. Hence, it must be drawn before these tubes.

C (Lavender, red, gray, green) YOUR ANSWER

Beginning with the lavender tube is incorrect, as it contains EDTA, an anticoagulant that could contaminate the red tube's sample if collected first. This would compromise the integrity of tests requiring serum, making this choice invalid.

D (Green, gray, lavender, red) YOUR ANSWER

This sequence is incorrect as it starts with the green tube, which should not be collected before the red tube. Collecting the green tube first would introduce heparin into subsequent samples, potentially invalidating the results of tests performed later.

Conclusion

The order of draw in venipuncture is essential for ensuring accurate laboratory results by minimizing the risk of cross-contamination. The correct sequence—red, green, lavender, gray—ensures that each sample is collected in a way that maintains its integrity. Understanding this order is fundamental for healthcare professionals involved in specimen collection.

Which of the following is the order of draw for the evacuated tube method of venipuncture

Red, green, lavender, gray is the correct order of draw for the evacuated tube method of venipuncture.

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