Which of the following is necessary to assure comprehensive quality for helium dilution and ni-trogen washout testing?
1. The accuracy and precision of the volume or flow-measuring device must be assured.
2. The accuracy and linearity of the gas analyzer must be verified.
3. Leak test must be acceptable while monitoring change in volume and gas concentrations over at least a minute.
4. Corrections for hemoglobin (Hb) and COHb must be included.
a. 2, 3, and 4 only
b. 2 and 3 only
c. 1, 3, and 4 only
d. 1, 2, and 3 only
ANS: D
Comprehensive quality assurance for helium dilution and nitrogen washout testing requires accu-racy and precision of the volume or flow measuring device, accuracy, and linearity of the gas an-alyzer and leak test must be acceptable levels.
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