A patient specimen is analyzed on an instrument known to be in control from previous assays performed on a calibrated instrument and gives a hemoglobin result of 13.2 g/dL
Two hours later it is evaluated on another instrument that is being evaluated for purchase by the laboratory. The result is 11.8 g/dL. This result, when compared with the first, is:
a. Acceptable agreement
b. Reportable
c. Precise agreement
d. Inaccurate
ANS: D
This result is inaccurate compared with the first because it is significantly different. Precision is not known, because multiple results are needed to determine precision; in addition, precision must be determined using the same instrument, not between instruments. Because it is not accurate, it cannot be reported.
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