Which test associated with purple tubes allows for dermal puncture?

The Complete Blood Count (CBC) is the correct choice because it is a common test that can be performed on blood collected in a purple-top tube, which contains EDTA as an anticoagulant. A CBC is typically performed to evaluate overall health and detect a variety of disorders, such as anemia, infection, and leukemia.

Dermal puncture, often referred to as a fingerstick, is a method of drawing blood where a small sample is obtained from the capillary beds, usually in a fingertip or heel, rather than performing a venipuncture, or drawing blood from a vein. For many point-of-care tests and specific laboratory tests, including CBCs in pediatric populations or in situations where a large blood volume is not required, a dermal puncture is an effective and less invasive method to collect blood samples. Additionally, the small amounts of blood obtained via dermal puncture are often sufficient for completing a CBC.

In contrast, while tests like electrolytes (LYTES - STAT), ammonia, or pregnancy tests may utilize other collection methods or tube types, they are not the standard tests performed with dermal puncture or purple tubes specifically for this purpose. Each of these tests has different requirements regarding blood volume and sample type,