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Recommending Alternative Site Testing to Patients
Decisions about whether to recommend alternative site testing (AST) should take into account the motivation
and knowledge level of the patient and his or her ability to understand the considerations relative to diabetes
and AST. If you are considering recommending AST for your patients, you need to understand that there is a
potential for a significant difference between fingertip/palm and alternative site blood glucose test results.
The difference in capillary bed concentration and blood perfusion throughout the body can lead to sample
site-to-site differences in glucose results. These physiological effects vary between individuals and can vary
within a single individual based upon his or her behavior and relative physical condition. Our studies
involving alternative site testing of adults with diabetes show that most persons will find their glucose level
changes more quickly in the fingers’/palms’ blood than the alternative sites’ blood.* This is especially
important when glucose levels are falling or rising rapidly. If your patient is used to making treatment
decisions based upon fingertip/palm readings, he or she should consider the delay, or lag-time, affecting the
reading obtained from an alternative site.
* Data on file
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