AMT CMLA Practice Questions - Certified Medical Laboratory Assistant (AMT) Exam

What additive is in a lavender (purple)-top tube and what is its mechanism of action?

Sodium heparin; activates antithrombin III to inhibit thrombin K2 or K3 EDTA; chelates calcium ions Sodium citrate; binds calcium in a 9:1 blood-to-additive ratio Potassium oxalate and sodium fluoride; preserves glucose

Correct Answer:

K2 or K3 EDTA; chelates calcium ions

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