Phlebotomy..which tube would you draw for a whole body sample, and why?

Phlebotomy is the act of drawing blood either for testing or transfusion. It is a skill employed by physicians and many professionals in allied health fields, including nurses, medical assistants, paramedics, and clinical laboratory scientists. Health care is a rapidly expanding industry, and a new professional, the certified phlebotomist, helps to reduce the workload of doctors and nurses by focusing exclusively on blood collection, particularly in hospitals and blood drives.

Depending on the regional characteristics of the organization they work for, phlebotomists may have to travel to collect samples (this is referred to as a domiciliary service). They may travel to nursing homes or outpatient clinics to collect samples.

Phlebotomists collect blood primarily by performing venipuncture and, for collection of minute quantities of blood, fingersticks. Blood may be collected from infants by means of a heel stick. Specially trained phlebotomists collect arterial blood samples from the radial or ulnar arteries near the wrist.

For "whole blood" you would use a Lavender Top (purple top) tube. For Electrolyte Panel you would use an SST Tube (Serum Separator).