Grades of the quality of respiratory muscle strength tests are useful indicators of the degree of confidence that a clinician may have in the results

A: Excellent effort with excellent repeatability (<5 cm H₂O difference among measurements)

B: Good effort with good repeatability (5 to 10 cm H₂O difference among measurements)

C: Fair to good effort with fair repeatability (10 to 20 cm H₂O difference among measurements)

D: Only one apparently good maneuver

F: Unable to obtain good maneuvers or very poor repeatability

Graphic 72052 Version 2.0

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