How many inversions are recommended for the lavender top tube?

The correct recommendation for the number of inversions for the lavender top tube is eight. This tube typically contains ethylenediaminetetraacetic acid (EDTA), an anticoagulant that prevents blood from clotting.

Inversions are important in ensuring that the anticoagulant is thoroughly mixed with the blood sample. The specific recommendation of eight inversions helps to achieve a homogeneous mixture without causing damage to the blood cells, which could impact the test results. Proper mixing through the inversion process allows for accurate laboratory test outcomes, particularly for tests such as complete blood counts (CBC) that rely on the integrity of the blood sample.

This guidance aligns with best practices in phlebotomy to ensure optimal test performance and reliability.