31
possible.
§
Take your meter with you to the lab.
NOTE:
Please consult with your healthcare professional regarding instructions
for conducting a fasting blood glucose test.
While staying at the laboratory
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.
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 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.
*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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