Lifescan SureStep Blood Glucose Monitor - Manual (Page 48)

RESULTS
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testing are useful to assess the accuracy of
patient results.” Consult your Healthcare
Professional about doing such a compari-
son. The following sections discuss how to
do such a comparison and the precautions
to consider in evaluating your results.
Comparing Meter and Laboratory Results
The OneTouch ® SureStep ® System is plasma
calibrated. Because most laboratories mea-
sure plasma glucose, you can directly com-
pare your meter test results with the lab
results. However, your meter blood glucose
test result may differ somewhat from your
laboratory result due to normal sources of
variation. Meter results can be affected by
factors and conditions that do not affect
laboratory results in the same way. Your
meter glucose result should agree with a
laboratory result within ±20% most of the
time under normal conditions. A result with-
in that range is considered accurate when
testing with the
OneTouch ® SureStep ® Meter.
However, results can differ by more than
±20% in some situations. Such results are
more likely to occur under the following con-
ditions:
◆ If you have recently eaten, exercised,
taken medication, or experienced
stress.
5 If you have eaten recently, the
blood glucose level from a fingerstick
can be up to 70 mg/dL higher than that
of a venous sample (blood drawn from a
vein) used for a lab test.
6
◆ For the most accurate comparison
between meter and laboratory results,
the meter test must be done within 10
to 15 minutes of the laboratory test. If
samples are taken more than 15 min-
utes apart, the two tests could have
very different results because blood
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