I agree with you that the hand-washing protocol taught by medical staff with regard to infection protection is overdone. Like you, I’ve performed tens of thousands of fingerstick test and not one infection. But there is good reason to wash your hands before performing a blood sugar check. From Interferences and Limitations in Blood Glucose Self-Testing, An Overview of the Current Knowledge, published by National Institute of Health, I found this passage:
Inappropriate handling of SMBG [self monitoring of blood glucose] has been identified as the most common factor affecting BG results; more than 90% of overall inaccuracies result from incorrect use of BG meters.4,18 Due to the minute blood samples utilized by modern BG systems, even minor contamination with glucose containing fluids may substantially increase the measurement. Sugar-containing products, such as fruits, can leave considerable amounts of glucose on the skin, thereby causing falsely high SMBG results.17,19,20 In daily practice, a substantial number of patients do not wash their hands before performing BG measurements.
The most persuasive part of this is the fact that the sample sizes we use are so small that even a small contamination will exert large results.
I don’t wash my hands before blood glucose checking to prevent infection but to provide the most accurate and precise number possible. I don’t wash my hands every time, but when I really want a solid number to calibrate my continuous glucose monitor then I make the extra effort.
By the way, can you please decipher, “CBSs”?