Racial Differences; Calculating Predicted Values Manually - Welch Allyn PneumoCheck Operating Instructions Manual

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RACIAL DIFFERENCES

If the race switch on the front panel of the printer is set to 2, the

calculated predicted values are computed as indicated in the tables

on pp. 54-58. If the race setting is set to

values are then multiplied by 0.85 (except for FEVi/FVC).

The PneumoCheck Printer/Charger calculates predicted values

automatically, and an asterisk is placed in the ABN column if the

actual parameter falls below the lower limit of normal (LLN).

Manual calculations can be made using the procedure and tables

which follow:

All predicted values (except as noted) are calculated using the

formula:

Value = (Fl x age) + (F2 x height) + constant

where the Fl and F2 multipliers and the constant are taken from the

appropriate table entry and height is in centimeters.

For example, using Knudson's 1983 tables, the predicted normal

FVC for a 20 year old male who was 6'0" tall would be calculated as

follows:

1. First convert the height to centimeters.

height = 72" x 2.54 cm/inch = 182.9 cm

the calculated predicted

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