Which is the correct order of draw for capillary samples?

In the context of capillary blood collection, the order of draw is crucial to avoid cross-contamination of additive materials that may interfere with test results. The correct order must adhere to the guidelines established to ensure the integrity of the specimens.

The correct answer indicates that the sequence should begin with non-additive tubes (NMS or Non-Medical Sang), followed by blood gas collection tubes, and then Serum Separator Tubes (SST). This order is important because non-additive tubes should be filled first when drawing capillary specimens, as any additives in subsequent tubes could contaminate the sample. Following the non-additive tubes with blood gas tubes ensures that their results are not compromised by the presence of gel or anticoagulants found in other types of tubes. Finally, the collection of SST follows since it is typically used for serum tests where separation of serum from cells is required.

In summary, this correct sequence adheres to established protocols for minimizing contamination and ensuring accurate laboratory results, which is fundamental to effective patient care and diagnosis.