I-QARE DS-WALKIE, Owner'S Booklet

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You may still have a variation from the result because
blood glucose levels can change significantly over short
periods of time, especially if you have eaten, exercised,
taken medication, or experienced stress
*1
. In addition, if
you have eaten, the blood glucose level from a finger
stick can be up to 70 mg/dL higher than blood drawn
from a vein (venous sample) used for a lab test
*2
.
Therefore, it is best to be fasting for 8 hours before
doing comparison tests. Factors such as the amount of
red blood cells in the blood (a high or low hematocrit) or
the loss of body fluid (severe dehydration) may also
cause a meter result to be different from a laboratory
result.
Please contact your healthcare provider if you have
questions.
References:
*1. Surwit, R.S., and Feinglos, M. N.: Diabetes Forecast (1988), April,
49-51.
*2. Sacks, D. B.: ’‘Carbohydrates.’‘ Burtis, C. A., and Ashwood, E.R. (ed.),
Tietz Textbook of Clinical Chemistry. Philadelphia: W.B. Saunders
Company (1994), 959.