Adjustments
The sengs for result displays of base excess and eGFR (Esmated Glomerular Filtraon Rate) are
determined in this tab.
BE Equaon Base excess of the extracellular uid or standard base excess is the
concentraon of tratable base minus the concentraon of tratable
acid when trang the average intracellular uid (plasma plus intersal
uid) to an arterial plasma pH of 7.40 at PCO
2
of 40 mmHg at 37°C.
Excess concentraon of base in the average ECF remains virtually
constant during acute changes in the PCO
2
and reects only
nonrespiratory component of pH disturbances. Select either opon:
Extra Cellular Fluid
Base Excess of Extracellular Fluid (BEecf)
BEecf = HCO
3
– 24.8 + 16.2 (pH – 7.4)
This is the default.
Blood
Base Ex
cess of Blood (BEb)
BEb = (1 - 0.014*Hb) * [HCO
3
- 24.8 + (1.43 * Hb
+ 7.7) * (pH - 7.4)]
eGFR E
quaon MDRD (default)
CKD-EPI 2009
eGFR Variants Select one of these opons:
Display both eGFR and Black/African American eGFR
Display only eGFR
Display only Black/African American eGFR
Note: Black/
African American eGFR displays as eGFR-a on the
instrument screen.
When nished, choose fr
om the opons shown at the boom of the screen:
• Previous to go back to the previous screen
• Discard to undo changes
• Finish Later to create a dra
• Next to open the next tab
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i-STAT Alinity — System Operaons Manual Art: 746300-01 Rev. N Rev. Date: 02-Nov-2022