Question

which should be performed is an evacuation tube contains a clot activator? centrifuge the tube immediately after drawing it invert the tube five time after drawing it fill it only half way shake it very vigorously before doing the stick

Explanation:

When an evacuation tube contains a clot activator, it should be inverted a few times (usually 5 - 8 times) after drawing to ensure the clot activator is well - mixed with the blood sample. Centrifuging immediately is premature as the clotting process needs time to occur. Filling it only half - way is not related to the presence of a clot activator. Vigorous shaking can cause hemolysis.

Answer:

Invert the tube five time after drawing it