CPT (Certified Phlebotomy Technician) Practice Exam

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What is sodium heparin used for?

Calcium levels
Glucose levels
Ammonium levels
Sodium levels

The correct answer is: Ammonium levels

Sodium heparin is commonly used as an anticoagulant in blood collection tubes. It prevents the blood from clotting by inhibiting the clotting factors. Therefore, it is not used to measure calcium, glucose, or sodium levels. Instead, sodium heparin tubes are typically used for tests such as ammonium levels.