Which of the following statements is false regarding measurement of the patient's forced vital capacity (FVC)?
a. The patient can be sitting or standing.
b. Nose clips are not required.
c. It is an effort-dependent test.
d. Accurate results can be obtained without patient cooperation.
ANS: D
The FVC is an effort-dependent maneuver that requires careful patient instruction, understand-ing, coordination, and cooperation. Spirometry standards for FVC specify that patients must be instructed in the FVC maneuver, that the appropriate technique be demonstrated, and that enthu-siastic coaching occurs. When measuring the FVC, the therapist needs to coach the preceding inspiratory capacity as enthusiastically as the FVC. According to the standards, nose clips are encouraged, but not required, and patients may be tested in the sitting or standing position. Alt-hough standing usually produces a larger FVC compared with sitting, sitting is considered safer in case of lightheadedness. It is recommended that the position be consistent for repeat testing of the same patient. FVC should be converted to body temperature conditions and reported as liters under body temperature, ambient pressure, saturated (BTPS) conditions.
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