What additive is present in lead-free blood collection tubes?

What additive is present in lead-free blood collection tubes?

• A. EDTA
• B. Sodium fluoride
• C. Citrate
• D. Heparin

Answer: (A)

Lead-free blood collection tubes use EDTA as the additive. EDTA acts as an anticoagulant by binding calcium, which prevents the blood from clotting and preserves cellular components for testing, especially hematology panels. Other additives serve different purposes in other tube types—sodium fluoride with potassium oxalate for glucose testing (glycolysis inhibition), citrate for coagulation studies, and heparin for plasma chemistry—but they are not the additives associated with lead-free tubes.

Lead-free blood collection tubes use EDTA as the additive. EDTA acts as an anticoagulant by binding calcium, which prevents the blood from clotting and preserves cellular components for testing, especially hematology panels. Other additives serve different purposes in other tube types—sodium fluoride with potassium oxalate for glucose testing (glycolysis inhibition), citrate for coagulation studies, and heparin for plasma chemistry—but they are not the additives associated with lead-free tubes.