How Often Must the Partial Thromboplastin Time (PTT)reference Interval Be

question 26

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

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