A purchased hemoglobin standard is used to adjust a hemoglobinometer. This standard is being used as a:
a. Control
b. Precision check
c. Delta check
d. Calibrator
ANS: D
Standards are used to calibrate instruments. Controls are used to routinely evaluate the accuracy of a method once it is calibrated. Precision is a measure of reproducibility, whereas delta checks compare a patient result with a previous result (same test on the same patient). This can only be done for a test result that essentially does not vary significantly from testing time to testing time.
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