Letter to the Editor| Volume 85, ISSUE 1, e14-e15, July 2009

Blood glucose monitoring: Milking the finger and using the first drop of blood give correct glucose values

      People with diabetes on insulin therapy are often advised to discard the first drop of blood and to refrain from milking the finger when monitoring blood glucose. The first drop is thought to be diluted with tissue fluid with a suspected low glucose content. Milking might enhance the leakage of tissue fluid. However, in normal skin interstitial fluid is mostly bound and only traces can be squeezed out. Furthermore, in the highly perfused skin of the fingertip the glucose content in blood and interstitial fluid should be almost the same. A possible dilution with traces of interstitial fluid should therefore not alter glucose content of the blood from the fingertips.


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