What is the correct order of draw for capillary specimens?

The correct order of draw for capillary specimens starts with the lavender top tube, followed by tubes containing other additives, and then tubes without additives. This order is significant because it minimizes the risk of cross-contamination between different types of additives that may interfere with test results.

Lavender top tubes typically contain EDTA, an anticoagulant that prevents blood clotting, and are often used for hematology tests. By drawing this tube first, the potential for contamination from additives present in other tubes is reduced when later tubes are filled. After the lavender top, it is acceptable to collect other tubes with different additives, as they may be required for various tests. Finally, tubes without additives can be drawn, as they do not have any substances that could affect previous samples.

This approach also aligns with the recommendations from organizations such as the Clinical and Laboratory Standards Institute (CLSI), ensuring consistent and reliable test results across various laboratory settings.