RADIOMETER ABL800 FLEX Reference Manual

6. Parameters ABL800 FLEX Reference Manual
Oxyhemoglobin dissociation curve (ODC), Continued
Determining the
actual
displacement
(continued)
Step Description
(II):
sO
2
> 0.97 (or erroneous) and p50(st) is keyed in.
Coordinates (P
0
, S
0
) are calculated from (p50(st), 0.5) using
equations 46.9 and 46.11.
Reference position of the ODC.
The ODC is shifted from the reference position to pass
through the point (P
0
, S
0
). In this position, the ODC reflects
the p50(st) of the patient, i.e., the particular patient but at
standard conditions.
The ODC is further shifted, as determined by the effect of
the measured parameters (“ac”), to its actual position. This
position reflects the p50(act) of the patient.
(III):
sO
2
> 0.97 (or erroneous) and no p50(st) has been keyed in.
Reference position of the ODC.
The position of the actual ODC can now be approximated
from the reference position, using the actual values of pH,
pCO
2
, FCOHb, FMetHb and FHbF to determine the shift
'ac'.
NOTE: The curves are used only to illustrate the principles of the ODC determination
Continued on next page
6-46

RADIOMETER ABL800 FLEX Specifications

General

Brand	RADIOMETER
Model	ABL800 FLEX
Category	Measuring Instruments
Language	English