Final answer:
A CPCT introduces anticoagulant substances into blood collection tubes to prevent coagulation, allowing for accurate blood analysis in laboratory testing and patient assessments.
Step-by-step explanation:
A Certified Phlebotomy Technician (CPCT) must introduce anticoagulant substances into collection tubes during blood draws to prevent the blood from clotting. This is essential in laboratory settings, especially when plasma or whole blood components are required for various tests. For instance, heparin or EDTA are commonly used anticoagulants that bind calcium ions in the blood or inhibit specific clotting factors, ensuring that blood remains in a fluid state for accurate analysis. The prevention of clotting allows for the proper assessment of coagulation pathways, medication levels, and the identification of potential clotting abnormalities, which is particularly important in patients at risk for thrombotic events, such as those with cardiovascular diseases.