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You may still have a variation from the result because blood
glucose levels can change significantly over short periods,
especially if you have recently eaten, exercised, taken
medication, or experienced stress.
2
In addition, if you have eaten
recently, the blood glucose level from a fingerstick can be up to
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 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.
References
1. Clarke, W.L., et al.: Diabetes Care, Vol. 10, No. 5 (1987), 622–628.
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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