RADIOMETER ABL800 FLEX, Reference Manual

Page: 178 / 206

ABL800 FLEX Reference Manual 6. Parameters
List of equations,
Continued
F HbF
(continued)
Step Description See…
3. s
O
2
(for fetal blood) = ODC (
p
O
2
,
est
, A,
T
); Eq.47
where
F
HbF = 1
4.
c
O
2
HbF
est
=
s
O
2
(fetal blood)
×
c
eHb
×
F
HbF
est
5.
∆
F
c c
c
HbF
O HbF O HbF
eHb
est
2 meas. 2 es
=
t
−
6.
If
|∆
F
HbF
est
| ≥
0.001, proceed to step
7
.
If
|∆
F
HbF
est
|
< 0.001, proceed to step 9.
7.
F
HbF
est, new
=
F
HbF
est, old
+
∆
F
HbF
est
8.
Return to step
2
.
9.
End of iteration. The value for
F
HbF has converged.
Eq. 50
[8]:
p O
2
(x,T)
The ODC is determined as described in equations 46 - 47 in
Oxyhemoglobin
Dissociation Curve
.
p
O
2
(x) is calculated by a numerical method, using:
Eq. Description See…
50.1
S = ODC(P,A,
T
) Eq. 47
50.2
( )
MetHb COHb 1
COHb MetHb 1
) ( O
i 2,
F F
F F S
T s
− −
− − ×
=
Eq. 46.12
50.3
( )
MetHb COHb 1 ) ( O
COHb
1
P
) ( O
i 2,
i 2,
F F T s
F
T p
− − ×
+
=
Eq. 46.10
50.4
( )
) ( O ) ( O +
) ( O MetHb COHb 1 tHb ) ( t
i 2, 2
i 2, i
T p T
T s F F c T
×
+ × − − × =
α
50.5
A = a
50.6 T
= patient temperature
50.7
[ ]
2 5
) 37 ( 10 21 ) 37 ( 115 . 0
2
00983 . 0 ) ( α O
− × × + − × −
−
× =
T T
e T
Continued on next page
6-41