Question 71

Moving the tubes in a figure-eight motion 4 to 8 times after collection

To prevent clotting, a phlebotomist should move the tubes in a figure-eight motion 4 to 8 times after collection. This method ensures thorough mixing of the anticoagulant with the blood sample, effectively preventing clot formation.

A) Shaking the tubes 4 to 8 times after collection

Shaking the tubes can lead to hemolysis of the blood sample, which compromises the integrity of the specimen. While it may seem effective for mixing, this method is not recommended as it can damage the red blood cells and affect test results.

B) Moving the tubes in a figure-eight motion 4 to 8 times after collection

This method is optimal for mixing the blood with the anticoagulant without causing damage to the cells. The figure-eight motion is gentle yet effective, ensuring uniform distribution of the anticoagulant and preventing clotting.

C) Rolling the tubes between the palms of the hands 4 to 8 times after collection

Rolling the tubes can be less effective than the figure-eight motion because it may not provide the same level of mixing. While it is a gentler method, it may not ensure adequate interaction between the blood and the anticoagulant.

D) Passing the tubes from hand to hand 4 to 8 times after collection

Passing the tubes from hand to hand does not sufficiently mix the blood with the anticoagulant. This method lacks the necessary agitation required to prevent clot formation effectively, making it less reliable than the correct option.

Conclusion

The method of moving the tubes in a figure-eight motion 4 to 8 times after collection is the most effective for preventing clotting, as it ensures proper mixing without causing damage to the sample. Other methods either risk hemolysis or do not provide adequate mixing, highlighting the importance of using the correct technique in phlebotomy practices.