Fora MD Manual Del Propietário página 45

● Fast for at least eight hours before doing comparison tests, if possible.
● Take your meter with you to the lab.
While staying at the lab:
Make sure that the samples for both tests are taken and tested within 15
minutes of each other.
● Wash your hands before obtaining a blood sample.
● Never use your meter with blood that has been collected in a gray-top
test tube.
● Use fresh capillary or venous blood only.
You may still have a variation from the result because blood glucos levels
can change significantly over short periods of time, 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 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 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: 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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