How should you mix blood samples in a lavender-top tube?

When mixing blood samples in a lavender-top tube, inverting gently 8 to 10 times is the correct method. Lavender-top tubes typically contain an anticoagulant, such as EDTA, which is used to prevent the blood from clotting. It is essential to mix the sample properly to ensure that the anticoagulant is evenly distributed throughout the blood.

Gentle inversion assists in mixing without causing hemolysis, which can occur if the sample is shaken vigorously. This helps preserve the integrity of the blood cells and the plasma. Stirring with a stick or leaving the tube stationary would not adequately mix the anticoagulant with the blood, potentially leading to erroneous lab results. Thus, the method of gentle inversion strikes the right balance for proper mixing while maintaining sample quality.