Why should EDTA tubes be inverted gently rather than shaken vigorously?

Why should EDTA tubes be inverted gently rather than shaken vigorously?

• A. Gentle inversions to mix anticoagulant without causing hemolysis
• B. Vigorous shaking is preferred
• C. No mixing is required
• D. Inversions should be avoided entirely

Answer: (A)

Mixing the EDTA properly is essential to keep the blood from clotting while preserving the integrity of the cells. EDTA binds calcium to prevent coagulation, so the blood must be gently distributed with the anticoagulant to ensure it works evenly. Gentle inversions about 8–10 times mix thoroughly without introducing excessive shear forces that could damage cells. Shaking vigorously can cause hemolysis and platelet activation, which can skew results in a complete blood count and other measurements. No mixing is not acceptable because clotting can occur if the anticoagulant isn’t distributed. Inversions should not be avoided entirely; they’re needed to mix the sample safely.

Mixing the EDTA properly is essential to keep the blood from clotting while preserving the integrity of the cells. EDTA binds calcium to prevent coagulation, so the blood must be gently distributed with the anticoagulant to ensure it works evenly. Gentle inversions about 8–10 times mix thoroughly without introducing excessive shear forces that could damage cells. Shaking vigorously can cause hemolysis and platelet activation, which can skew results in a complete blood count and other measurements. No mixing is not acceptable because clotting can occur if the anticoagulant isn’t distributed. Inversions should not be avoided entirely; they’re needed to mix the sample safely.