Difficulty: Easy

Average Score: 100%

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 evacuated tube containing sodium citrate ensures proper mixing of the anticoagulant with the blood sample, which is crucial for preventing coagulation and obtaining accurate laboratory results.

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

This action is unnecessary and could lead to contamination or incorrect sample collection. The posterior needle is designed to be inserted into the vein first to ensure that blood enters the tube properly, making this option inappropriate for safe and effective blood collection.

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

Filling the tube only halfway does not provide an adequate volume for testing and can lead to inaccurate results. For sodium citrate tubes, it is important to fill them to the indicated fill line to maintain the correct blood-to-anticoagulant ratio, ensuring reliable laboratory analysis.

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

Centrifuging the tube right after drawing it is contraindicated for sodium citrate tubes because the sample needs to be mixed with the anticoagulant first. Centrifugation before proper mixing can cause clot formation, compromising the sample's integrity and the accuracy of test results.

Conclusion

When handling evacuated tubes containing sodium citrate, proper mixing through gentle inversion is essential to ensure that the anticoagulant effectively prevents clotting. Other choices, such as improper filling, unnecessary needle actions, or premature centrifugation, can jeopardize the sample's quality and the reliability of test outcomes. By following the correct procedure, medical assistants help maintain the integrity of blood samples for accurate diagnostic evaluation.

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