Summary of the practical recommendations for applying Global Lung Function Initiative transfer factor of the lung for carbon monoxide (TLCO) reference values
| Barometric pressure (altitude) | TLCO and KCO values should be adjusted to standard pressure (101.3 kPa or 760 mmHg) prior to calculation of predicted values |
| Anatomic dead space | Anatomic dead space should be either measured from the tracer gas washout or estimated using body size |
| Hb | TLCO values should be uncorrected for Hb; Hb levels should be considered in the interpretation |
Hb: haemoglobin; KCO: transfer coefficient of the lung for carbon monoxide.