How is the accuracy of a blood gas analyzer determined?
a. Examining the repeatability of the analyz-er's results
b. Comparing the analyzer's measurements to known values
c. Adjusting the offset (or balance) of the instrument
d. Adjusting the gain (or slope) of the in-strument
ANS: B
Typically, this involves using samples with known values to assess both the accuracy (comparing the value from the tested instrument with a known value) and the precision (examining the re-peatability of results) of the instrument.
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