Comparing Monitor and Laboratory Results
Test results from the monitor and laboratory are both expressed in plasma-
equivalent units. However, the result you obtain from your monitor may dif
-
fer somewhat from your laboratory result due to normal variation. Monitor
results can be affected by factors and conditions that do not affect labora
-
tory results in the same way. (See test strip package insert for typical ac-
curacy and precision data, and for important information on limitations.) To
make an accurate comparison between meter and laboratory results, follow
the guide-lines below.
Before you go to the lab:
Perform a control solution test to make sure that the monitor is work -
ing properly.
It is best to fast for at least eight hours before doing comparison
tests.
Take your monitor with you to the lab.
While at the lab:
Make sure that the samples for both tests (the monitor test and the lab
test are taken and tested within 15 minutes of each other.)
Wash your hands before obtaining a blood sample.
Never use your monitor with blood that has been collected in a gray-
top test tube.
Use fresh capillary blood only.
You may still have a variation from the result because blood glucose levels
can change significantly over short periods, especially if you have recently
eaten , exercised, taken medication, or experienced stress*
6
. In addition, if
you have eaten recently, the blood glucose level from a finger stick can be
up to 70 mg/dL(3.9 mmol/L) higher than blood drawn from a vein (venous
sample) used for a lab test*
7
.
BLOOD GLUCOSE MEASUREMENT
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