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    Hematology Clinical Principles and Applications
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    Exam 45: Laboratory Evaluation of Hemostasis
  5. Question
    How Often Must the Partial Thromboplastin Time (PTT) Reference Interval
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How Often Must the Partial Thromboplastin Time (PTT) Reference Interval

Question 2

Question 2

Multiple Choice

How often must the partial thromboplastin time (PTT) reference interval be determined?


A) Only when both the normal and abnormal controls are outside their acceptable limits
B) At least every 6 months
C) With each new lot of reagent
D) Only when the normal control is outside its acceptable limits

Correct Answer:

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