OneTouch Ultra Owner's Booklet page 49

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While at the lab:
Make sure that the meter test and the lab test are performed within
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15 minutes of each other.
Wash your hands before obtaining a blood sample.
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Use only fresh capillary blood obtained from the fingertip.
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You may still have a variation from the laboratory result because
blood glucose levels can change significantly over short periods,
especially if you have recently eaten, exercised, taken medication,
or experienced stress.
blood glucose level from a fingerstick can be up to 70 mg/dL higher
than blood drawn from a vein (venous sample) used for a lab test.
Therefore, it is best to fast for eight hours before doing comparison
tests. Factors such as the percentage 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. Surwit, R.S., and Feinglos, M.N.: Diabetes Forecast (1988), April, p. 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), p. 959.
In addition, if you have eaten recently, the
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