Think you mean fasting insulin for $30, that's about the cost for one at the direct to consumer labs.
The NMR test does give more information 1. If your doctor knows how to interpret it and 2. It is not impacted by your weight loss. You have lost quite a bit of weight quite fast, some of the fat might be cruising around your bloodstream when the blood is drawn, and it will show up in both a basic lipid panel or NMR. http://www.wheatbellyblog.com/2015/...nfuses-doctors/
Dr Naiman just uses the basic panel and checks the Trig/HDL ratio. The NMR use to cost about $100, about the same as a CAC test, which I now think may give more useful information at this point in your journey to good health.
Fasting longer does not work well, and may even make the lipids worse, though I did drive down my glucose and insulin by trying that once.
Stick to the recommended 12-14 hours and get a good baseline. Think of cholesterol as an "energy system" and read some of the crazy new info from Dave Feldman, about how lipids can be manipulated in the short term. http://forum.lowcarber.org/showthread.php?t=477759
Interesting stuff, but still think you should not do that this time. Eat your normal LC meals, fast the hours suggested, and get a good reading (understanding that the fatty acids released into your blood may throw those numbers off anyway)