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After positively identifying my patient (my lab supervisor), and double checking that the insulin type (rapid acting Humalog) was accurate and not expired, I proceeded to uncap the needle, picked up the vial of insulin and then promptly botched the draw by ramming the tiny needle tip into the metal seal of the insulin vial, rendering the needle dirty, dull and useless

One of the significant advantages is the renewal of energy levels

Harris PJ (1997)

Therapeutic fasting has become quite popular due to its immediate positive effect on regulating blood sugar and insulin levels, allowing for the burning of body fat through ketosis, and temporary relief from gut-related issues

This explains why you've probably seen slightly different ranges for the same test depending on where your blood is drawn