42
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 recently eaten,
exercised, taken medication, or experienced stress. In
addition, the blood glucose level from a finger prick can be
up to a 20% variance from blood drawn from a vein (venous
sample) used for a lab test*
2
. Therefore, it is best to fast
for eight 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 (dehydration)
may also cause a meter result to be different from a
laboratory result.
References
*2: Schrot, M.D., Patel, M.D., and Foulis, M.D.; Clinical
Diabetes, 25; 43-49, 2007.
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