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References
*2: Surwit, R.S., and Feinglos, M.N.: Diabetes Forecast (1988), April, 49-51.
*3: Sacks, D.B.: “Carbohydrates. “ Burtis, C.A., and Ashwood, E.R.( ed.), Tietz Textbook of
Clinical Chemistry. Philadelphia: W.B. Saunders Company (1994), 959.
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 expe-
rienced stress*
2
. In addition, if you have eaten recently, the blood
glucose level from a finger prick 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*
3
. Therefore, it is best to fast for eight hours before doing com-
parison tests. Factors such as the amount of red blood cells in the
blood (a high or low hematocrit) or the loss of body fluid (dehydra -
tion) may also cause a meter result to be different from a laboratory
result.