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Comparing Meter and Laboratory Results
Your On Call
®
Extra Blood Glucose System and laboratory results both report the
glucose concentration in the serum or plasma segment of your blood. However,
the results may differ somewhat due to normal variation. The Meter results can be
affected by factors and conditions that do not affect laboratory results in the same
way. See On Call
®
Extra Test Strips’ package insert for typical accuracy and
precision data, and for important information on limitations.
To ensure a reasonable comparison, follow these guidelines.
Before you go to the lab:
• Bring your meter, test strips and control solution with you.
• Make sure your meter is clean.
• Perform a quality control test to make sure the meter is working properly.
• Comparisons will be more accurate if you do not eat for at least four hours
before testing. Eight hours is preferable.
At the lab:
• Wash your hands before obtaining a blood sample.
• Take blood samples for a laboratory test and for your meter within 10 minutes
of each other. This will ensure an accurate comparison of results.
• Never test blood that has been placed in test tubes containing fluoride or other
anticoagulants which are not suggested. This will cause falsely low results.
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