What is the correct order of tubes needed to collect for an aPTT, stat lytes, and blood cultures?

The correct sequence for drawing blood samples for specific tests is critical to ensure accurate test results. Blood collection tubes have different purposes and additives that can affect the sample if not drawn in the correct order.

For an Activated Partial Thromboplastin Time (aPTT) test, a light blue tube is needed because it contains sodium citrate, which is an anticoagulant that preserves the clotting factors in the sample. The light blue tube should be drawn first to prevent contamination with other additives.

The yellow tube, used for blood cultures, is drawn next. This tube typically contains a broth that helps support the growth of bacteria and other pathogens. Its placement after the light blue tube helps to avoid any potential contamination from additives in other tubes, ensuring the integrity of the cultures.

Finally, the PST (Plasma Separator Tube), which is used for stat electrolytes, is collected afterward. This tube contains a gel that separates the plasma from the cells upon centrifugation, allowing for quick analysis of electrolyte levels.

In summary, the order of drawing the tubes — light blue for aPTT, yellow for blood cultures, and PST for stat electrolytes — is essential for maintaining the integrity of the samples and achieving accurate laboratory results.