Comprehensive Quality Assurance of Pulmonary Function Testing Consists of Which

Multiple Choice

Comprehensive quality assurance of pulmonary function testing consists of which of the following:
1) The accuracy and precision of the measured instrument.
2) Patient must be able to do a breath-hold between 3 and 5 sec.
3) The performance of the technologist.
4) Test results when measuring a standard.

A) 2, 3, and 4 only
B) 2 and 3 only
C) 1, 3, and 4 only
D) 1, 2, and 3 only