A laboratory comparing its results to those of other laboratories on the same specimen is an example of:
a. Precision monitoring
b. Internal quality control
c. External quality control
d. Delta checks
ANS: C
When results are compared with those of another laboratory, this is part of external quality control. Internal quality control is done totally within one laboratory. Delta checks compare a patient result with a previous result on the same patient. Precision is determined by multiple analysis of the same specimen.
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