Clever Choice Auto-Code Pro Owner's Manual page 44

You may still have a variation from the result because blood glucose
levels can change significantly over short periods of time, espe-
cially if you have recently eaten , exercised, taken medication, or
experienced stress* . In addition, if you have eaten recently, the
2
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* . Therefore, it is best to fast for eight hours
3
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 differ-
ent from a laboratory result.
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.
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