Insulin levels are not very helpful
Blood insulin levels as a lab test have been around for a while, however no practical usefulness of this result has been found and hence it has not entered routine clinical practice. It continues to be done in research settings as part of clinical trials and drug development.
High levels are often an indicator of Insulin resistance
although caution is required interpreting this because a simultaneous blood glucose
level is necessary. If blood glucose levels are below normal then insulin should also normally be low. But if it is high in such instances then it can signify the presence of other conditions, some of which are worrisome