Table 8: Grading of body plethysmography.

Grading system for a lung volume test using BP

Grade

Number

of FRC

measurements

Number

of SVC

measurements

FRC

repeatability

A

≥ 3 Acceptables

≥ 3 Acceptables

Within 5%

B

≥ 2 Acceptables

≥ 2 Acceptables

Within 5%

C

≥ 2 Acceptables

≥ 2 Acceptables

Within 10%

D

1 Acceptable

and ≥ 1 usable

1 Acceptable

and ≥ 1 usable

Within 10%

E

1 Acceptable

and 0 usable

1 Acceptable

and 0 usable

NA

U

0 Acceptable

and ≥ 1 usable

0 Acceptable

and ≥ 1 usable

Within 10%

F

0 Acceptable

0 usable

FRC = functional residual capacity.

NA = not applicable.

SVC = slow vital capacity