Document ID: chunk:federal_register_of_legislation:F2016L01332:reg:4b
Version: federal_register_of_legislation:F2016L01332
Segment Type: reg
Provision Reference: reg 4B
Character Range: 49229–50581

4B

Work out the predicted FEVl, FVC, and MEF25-75 for a person of the
same age, height, and gender. This can be done either by applying the
nomograms Figure 1a (for males) or Figure 1b (for females) or by applying the formula relating to each nomogram.

    Substep Express the measured FEV1 as a percentage of the predicted FEV1, and
4C Express the measured FVC as a percentage of the predicted FVC, and Express the measured MEF25-75 (if appropriate) as a percentage of the predicted MEF25-75.
           These conversions are performed by applying the formula:

           Measured value as % of predicted value =

Actual value x 100
Predicted value

Substep Determine an impairment rating from a physiological measurement by
     4D using the percentage obtained in substep 4C in conjunction with Table
           1.4. Separate impairment ratings can be obtained from each physiological
measurement (that is, from the FEV1, FVC, and MEF25-75).

    Substep The final impairment rating is the highest (or equal highest) of the ratings
     4E obtained in substep 4D.

Functional Loss
Table 1.2

LOSS OF CARDIORESPIRATORY FUNCTION: EXERCISE TOLERANCE
(Males)
    Age Symptomatic Activity Level Age Symptomatic Activity Level
             (METs*)  (METs*)
    less
    than 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 10+  1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 10+