What is the order of draw for micro capillary tubes?

The correct order of draw for micro capillary tubes emphasizes the importance of avoiding contamination between different types of blood collection tubes and preserving the integrity of the samples being collected.

In the context of micro capillary draws, the correct sequence begins with blood draws, which is crucial because it ensures that any contaminants from previous tubes do not affect the samples tested later. Following blood draws, EDTA tubes are collected next. EDTA is an anticoagulant that helps preserve blood components for certain tests, and drawing it after the initial blood sample limits the potential for contamination from other additives.

Next in the order are tubes containing other additives. These additives can vary widely in their functions, including promoting clotting or stabilizing certain components of the blood. Lastly, serum tubes are drawn. Serum tubes are typically used for tests requiring clotted blood, and drawing them last prevents contamination with anticoagulants used in previous tubes, which could interfere with the clotting process.

This rationale reinforces the protocol for ensuring sample integrity and the accuracy of laboratory results, emphasizing the systematic approach needed in clinical settings when drawing and processing blood.