Abbott i-STAT Alinity, Operation Manual, Page: 228 / 296

Adjustments
The settings for result displays of base excess and eGFR (Estimated Glomerular Filtration Rate) are
determined in this tab.
BE Equation Base excess of the extracellular fluid or standard base excess is the
concentration of titratable base minus the concentration of titratable
acid when titrating the average intracellular fluid (plasma plus interstitial
fluid) to an arterial plasma pH of 7.40 at PCO
2
of 40 mmHg at 37°C.
Excess concentration of base in the average ECF remains virtually
constant during acute changes in the PCO
2
and reflects only
nonrespiratory component of pH disturbances. Select either option:
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 Excess of Blood (BEb)
BEb = (1 - 0.014*Hb) * [HCO
3
- 24.8 + (1.43 * Hb
+ 7.7) * (pH - 7.4)]
eGFR Equation MDRD (default)
CKD-EPI 2009
eGFR Variants Select one of these options:
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 finished, choose from the options shown at the bottom of the screen:
•
Previous to go back to the previous screen
•
Discard to undo changes
•
Finish Later to create a draft
•
Next to open the next tab
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i-STAT Alinity — System Operations Manual Art: 746300-01 Rev. N
Rev. Date: 02-Nov-2022