Phlebotomy protocols establish a specific sequence for filling blood collection tubes to protect sample integrity. This procedure, known as the blood collection tubes order of draw, is not arbitrary but is grounded in preventing cross-contamination between tube additives. Following the correct sequence ensures that chemical additives from one tube do not carry over into the […]

In clinical laboratories, the lavender-top vacuum tube for blood collection is a familiar sight. This color indicates the presence of Ethylenediaminetetraacetic acid, or EDTA, a key anticoagulant. The primary function of this additive is to bind calcium ions in the blood sample, effectively preventing the coagulation cascade. This action preserves blood in its liquid, whole-blood state,

A common question in clinical settings involves the proper handling of venous blood gas (VBG) samples after collection. Specifically, there is often uncertainty about whether these samples require immediate icing. The stability of analytes within a venous blood gas collection tube dictates the correct protocol. Adhering to the right procedure is necessary to maintain sample integrity