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
ANS: C
The PTT reference interval must be determined with each new lot of reagent and at least once per year.
Health Professions
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