Abbott i-STAT 1 System Manual page 190

Flags When the analyzer detects an out-of-range result or an uncharacteristic sensor
signal, the condition is indicated by a flag. See table below for flags and
symbols used with results. Note: The reportable range flags do not apply when
testing is performed under Quality Tests Option 3 – Cal Ver. Action flags do not
apply to Option 1 – Control or Option 3 – Cal Ver.
12-4
Display Action
> The result falls above the
reportable range of the test.
< The result falls below the low end
of the reportable range of the
test.
< > This result is dependent on
another test that has been
flagged.
The <> flag will also be displayed
, pH, PCO
for TCO
2
anion gap, base excess, and sO
if the TCO is <1 or >80 mmol/L.
2
Because the values outside
this range are essentially non-
physiological, the TCO
check is used as an additional
quality check on the validity of
the underlying pH and PCO
results.
The result is above the high

action range.
The result is below the low action

range.
The signals from a particular
***
sensor are uncharacteristic.
Uncharacteristic signals can
be caused by a compromised
sensor or by an interferent in the
sample.
This flag also appears for any
test dependent on another test
which is flagged with stars.
Art: 714374-01M
Analyzer Response / Comments
If an ACT result is displayed
as >1000, the result should be
reported as "greater than 1000
seconds."
If a pH result is displayed as
<6.5, the result should be
reported as "less than 6.5."
If a sodium result is displayed
as >180, the calculations for
potassium, chloride, BUN/Urea
and hematocrit, which depend
upon the sodium measurement,
, HCO ,
2 3
will be flagged < >.
2
range
2
2
If the action ranges for potassium
are 3.2 and 5.5, a result of 6.0
will be displayed as 6.0 .
If the action ranges for potassium
are 3.2 and 5.5, a result of 3.0
will be displayed as 3.0
The sample should be retested
using another cartridge.
If the stars reappear, refer to the
troubleshooting paragraph in this
section of the manual.
.

Rev. Date: 23-Feb-16