Difficulty: Easy

Average Score: 93%

Which of the following actions should a medical assistant take when an evacuated tube contains sodium citrate?

Rationale

Gently invert the tube 3 to 4 times after drawing it.

Inverting the tube is essential to ensure proper mixing of the blood sample with the sodium citrate anticoagulant, which prevents clotting and preserves the sample for accurate testing.

A (Push the posterior needle through the tube stopper before puncturing the vein.) YOUR ANSWER

This action is inappropriate and unsafe as it could lead to contamination or improper sample collection. The needle should only be inserted into the vein to draw blood, and the tube should be filled directly from the blood flow without any pre-puncture manipulation.

B (Fill the tube with blood only to the halfway point.) YOUR ANSWER

This choice is incorrect because it does not allow for adequate mixing with the anticoagulant. For tests requiring sodium citrate, the tube must be filled to the appropriate volume to ensure the correct ratio of blood to anticoagulant, which is critical for reliable test results.

D (Centrifuge the tube immediately after drawing it.) YOUR ANSWER

Centrifuging the tube right after drawing can lead to clot formation if the blood has not been mixed with the anticoagulant properly. It is vital to first gently invert the tube to mix the blood with sodium citrate before any centrifugation occurs, to prevent erroneous test results.

Conclusion

Effective handling of blood samples is crucial in laboratory settings, particularly when using anticoagulants like sodium citrate. The correct procedure involves gently inverting the tube 3 to 4 times post-draw to ensure proper mixing, which is vital for accurate laboratory analysis. Failing to follow this step can result in clot formation and inaccurate test outcomes, underscoring the importance of proper sample handling protocols.

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