nti242f-T7

Table 7: Acceptability criteria for the linked spirometry maneuver.

Spirometry maneuver after functional residual capacity (FRC) measurement.

Acceptable*

Linked spirometry

• If > 6 years, SVC ≥ (FVC–150 mL)

• If ≤ 6 years, SVC ≥ (FVC–100 mL) or

(FVC – 10% of FVC), whichever is lower

Usable‡

Any of:

• If > 6 years, SVC ≥ (FVC–250 mL)

• If ≤ 6 years, SVC ≥ (FVC–200 mL) or

(FVC – 10% of FVC), whichever is less

Not

acceptable

or rejected

Any of:

• Spirometry not linked to PC

• If > 6 years, SVC < (FVC–250 mL)

• If ≤ 6 years, SVC < (FVC–200 mL) or

(FVC – 10% of FVC), whichever is lower

FRC = functional residual capacity.

FVC = forced vital capacity. S

VC = slow vital capacity.

* Meets American Thoracic Society (ATS)/European Respiratory Society (ERS) criteria for within-maneuver assessment of inspiratory capacity and SVC. If forced spirometry is not performed in the same session as lung volumes, an alternative is to obtain at least three vital capacity measurements that meet ERS/ATS acceptability criteria for within-maneuver assessment and the largest of these vital capacities is a surrogate for FVC in this table.

‡ Interpret with caution.