In Figure 3 of the ATS's Recommendations for a Standardized Pulmonary Function Report (2017) example PFT, there is a measurement DLCO (pred adj Hb 13.8 g/dL). In the caption for Figure 3, it is stated:
pred adj Hb = hemoglobin adjusted for predicted value
It's unclear to me what this means - is the observed value adjusted for some predicted value of hemoglobin, or is the predicted value adjusted for a hemoglobin value of 13.8 g/dL?
My best guess is it means the predicted value is adjusted for a hemoglobin value of 13.8 g/dL. Note that the provided values for DLCO (at standard PB) and DLCO (pred adj Hb 13.8 g/dL) have equivalent results but different % pred:
DLCO (at standard PB):
- result = 13.0
- % pred = 42%
DLCO (pred adj Hb 13.8 g/dL):
- result = 13.0
- % pred = 53%
This leads me to believe the predicted value has been adjusted for hemoglobin, and the result value is maybe even the same measurement (ie a duplicate value of the DLCO (at standard PB) result is inserted into the table).
There's a LOINC code for "Diffusion capacity.carbon monoxide adjusted for hemoglobin" which I thought corresponded to this. But that does not seem to apply here if DLCO (pred adj Hb 13.8 g/dL) means the predicted value was adjusted and the result value was not adjusted.
Implications
If my above guess is correct, then our profiles DLCOAdjustedForHemoglobin and DLCOAdjustedForHemoglobin_PercentOfPredicted will need to be updated.
In Figure 3 of the ATS's Recommendations for a Standardized Pulmonary Function Report (2017) example PFT, there is a measurement
DLCO (pred adj Hb 13.8 g/dL). In the caption for Figure 3, it is stated:It's unclear to me what this means - is the observed value adjusted for some predicted value of hemoglobin, or is the predicted value adjusted for a hemoglobin value of 13.8 g/dL?
My best guess is it means the predicted value is adjusted for a hemoglobin value of 13.8 g/dL. Note that the provided values for
DLCO (at standard PB)andDLCO (pred adj Hb 13.8 g/dL)have equivalent results but different % pred:DLCO (at standard PB):
DLCO (pred adj Hb 13.8 g/dL):
This leads me to believe the predicted value has been adjusted for hemoglobin, and the result value is maybe even the same measurement (ie a duplicate value of the
DLCO (at standard PB)result is inserted into the table).There's a LOINC code for "Diffusion capacity.carbon monoxide adjusted for hemoglobin" which I thought corresponded to this. But that does not seem to apply here if
DLCO (pred adj Hb 13.8 g/dL)means the predicted value was adjusted and the result value was not adjusted.Implications
If my above guess is correct, then our profiles
DLCOAdjustedForHemoglobinandDLCOAdjustedForHemoglobin_PercentOfPredictedwill need to be updated.