Interpretation. NDD EasyOne 2010, EasyOne 2001

EasyGuide Page 22

11 Interpretation

Automatic interpretation can be activated (Setting: NLHEP or GOLD/HARDIE) or deactivated under “Configuration” (see Chapter 8)

11.1 NLHEP Interpretation

The diagram below describes how the interpretation is determined (see reference [4])..

START no

Caution: Interpret with care test session good yes

FEV1/FVC

>= LLN no yes

FVC < LLN yes no normal spirometry

4 low vital capacity possibly due to restriction of lung volumes

FEV1

>= LLN no yes

FEV1 >= 60% predicted no yes yes

FEV1 >= 40% predicted no normal spirometry

4 mild obstruction moderate obstruction severe obstruction

FVC <LLN and low vital capacity possibly due to restriction of lung vol.

yes

Notes: 1. LLN = Lower Limit of Normal

2. Where FVC is indicated in chart FEV6 may be substituted, if used.

3. Where there is no lower limit of normal (LLN) defined within the selected predicted normal, the value used for LLN is calculated as Predicted Value – 1.645 x SEE (standard error of the estimate). If SEE is not defined LLN of

FEV1/FVC is set to 90% of Predicted Value, LLN of FEV1 is set to 80% of Predicted Value; LLN of FVC is set to 80% of Predicted Value.

4. If the quality grade is D and the results are within normal limits, the interpretation states “normal, but the reported values should not be used for comparisons with previous or subsequent tests.”