While doing clinicals in the ICU I had the RN tell me that you should not inject more than 5u of insulin per injection site because the body cannot absorb more than that from one location. So for a patient that needs 15 units for example you would inject 5u in upper arm, 5u a few inches lower and 5u a few inches lower-all from the same needle and syringe.
I had never heard this so I asked him if he was taught this in nursing school. He said no but his brother who is an NP at a diabetes clinic teaches it to all his patients. I have scoured the internet for research to back this up but have not come across anything.
Has anyone heard this before? Do you believe its true? Is there research to back it up?