When should the inversion be performed?

When should the inversion be performed?

• A. Before filling the tube.
• B. Immediately after filling.
• C. During storage.
• D. After centrifugation.

Answer: (B)

Immediately after filling the tube. This quick inversion mixes the blood thoroughly with the tube’s additive, ensuring the anticoagulant or clot activator is evenly distributed. Proper mixing right away helps prevent clot formation when anticoagulants are present and ensures consistent test results. If you wait, clotting can begin or the additive may not distribute evenly, which can skew results. Inverting before filling has nothing to mix, and doing it during storage or after centrifugation can disturb the sample or won’t fix changes that have already occurred.

Immediately after filling the tube. This quick inversion mixes the blood thoroughly with the tube’s additive, ensuring the anticoagulant or clot activator is evenly distributed. Proper mixing right away helps prevent clot formation when anticoagulants are present and ensures consistent test results. If you wait, clotting can begin or the additive may not distribute evenly, which can skew results. Inverting before filling has nothing to mix, and doing it during storage or after centrifugation can disturb the sample or won’t fix changes that have already occurred.