User's Manual

i15 Blood Gas and Chemistry Analysis System User Manual Theory
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The default value for MCHC is 34g/dL. The unit for Hct is %PCV.
sO
2
(est)
An estimation of hemoglobin oxygen saturation: a ratio of hemoglobin bound to oxygen to the
total amount of hemoglobin able to bind oxygen
*3 *
22
2
*3 *
22
( ) 100
pO pO
sO est
pO pO
α
αβ
+×
= ×
+× +
[%]
pO2 (A-a)
Alveolar-arterial oxygen tension difference
pO
2
(A-a) = pO
2
(A) - pO
2
(a) [mmHg]
pO
2
(a/A)
Arterial-alveolar oxygen tension ratio
pO
2
(a/A) = pO
2
(a) / pO
2
(A) [mmHg]
RI
Respiratory index: the ratio of the alveolar-arterial blood oxygen-pressure difference to arterial
pO
2
RI = pO
2
(A-a) / pO
2
(a)
pO
2
/ FIO
2
The ratio of arterial pO
2
to the fraction of inspired oxygen
pO
2
/ FIO
2
= pO
2
/ FIO
2
[mmHg]
pH (T)
pH value corrected for entered patient temperature
pH (T) = pH – [0.0147 + 0.0065 × (pH – 7.4)] (T – 37)
cH
+
(T)
Hydrogen ion concentration corrected for entered patient temperature
cH
+
(T) = 10
(9 – pH (T))
[nmol/L]