Clinical Medical Assistant Exam Practice Question
Which anticoagulant is commonly used in a tube for PT and aPTT testing?
Correct Answer: D
Rationale: Sodium citrate is the preferred anticoagulant for PT and aPTT testing as it effectively binds calcium, preventing clotting without interfering with the tests' results.
Sodium fluoride, while used for glucose testing, is not suitable for coagulation tests as it can inhibit platelet function and alter results.
EDTA is primarily used for complete blood counts and can distort coagulation test outcomes due to its strong binding of calcium.
Heparin, although an anticoagulant, is not ideal for routine PT/aPTT testing as it can lead to variable results and is typically used in other clinical settings.
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