Nationally Registered Certified Medical Assistant (NRCMA) (NAHP) Practice Exam

The correct choice indicates that when a venipuncture is performed using a lavender top vacutainer tube, the sample contains a clot activator and should be immediately centrifuged.

Lavender top tubes are commonly used for hematology tests, such as Complete Blood Counts (CBC). The additive in these tubes is usually EDTA (Ethylenediaminetetraacetic acid), which acts as an anticoagulant. This means that rather than assisting in clot formation, EDTA prevents blood from coagulating, allowing for accurate analysis of blood cell components.

Immediate centrifugation of this type of tube is not required; however, timely processing is important for the stability of certain components. Centrifuging separates the blood components, but since this tube contains an anticoagulant, it does not form clots.

The choice about the sample requiring no special handling is somewhat misleading, as while general handling may be simple, there are specific protocols for testing and processing that need to be followed for optimal results.

Overall, the selection signaling both the presence of a clot activator and the need for centrifugation accurately reflects the purpose and use of the lavender top tube in laboratory procedures.