If you want to find out what your own insulin production is - you can do two things
a) arrange for a fasting insulin test which ill tell you the ball park levels of your fasting insulin
an b) do an OGTT insulin assay - which shows your insulin responds over time since eating. ( look up Kraft curves for details) - in the US you can do this as a home test via Meridian valley labs
http://meridianvalleylab.com/Kraft-Prediabetes-Profile
Some of us outside the US have done home OGTT tests of glucose only which give an approximation based on the shape of the curve and the data here using Rapilose which you can buy on amazon. You can then correlate that with the data provided by the Kraft labs .. ( example attached)
This is a worked example of a guy using the Meridian Valley lab tests
http://www.buttermakesyourpantsfalloff.com/glucose-insulin/
Finally here is the paper butter bob mentions which which correlates fasting insulin with HDL, Triglycerides , waist to height ratios and BMI in adolescents - pity I can't find one for adults but the principles look the same.
http://ajcn.nutrition.org/content/86/1/33.full.pdf