Not to be nit-picky or anything, but...
"Humulin" is actually a brand name for a bunch of types of insulin made by Eli Lilly. Check it out on Wikipedia en.wikipedia.org/wiki/Humulin
if you want cool details on how they actually make your insulin. : )
Regular, or R insulin, can be made by different companies, but all Regular works the same. The terms can't be used interchangeably.
K, the only reason I can think that your doctor would want to put you on R for a while is because its longer lasting that humalog/novolog, and if you are having problems normalizing after your bout of DKA, he might think it will give you more "time" coverage, and therefor help you stay lower longer.
Because humalog/novolog are such quick and short acting forms of insulin, they only last for 2-3 hours tops. That means if you need more around the clock coverage (at least temporarily) moving to a different and longer lasting form of insulin might help. R has a lifespan of 4-6ish hours, so maybe the idea is that it will help you stay lower longer? I'm no expert though, and don't forget that its always a good idea to ask your doctor WHY he wants to do things, and to keep asking until you get an answer that you understand.
As for my experience with R, I did 13 years on twice daily injections of R + NPH (longer lasting, 8-12hours or so) which worked so-so. I never used R by itself, so its hard to say for sure, but I'm pretty sure most of my problems came from the NPH. As long as you trust your doc to know what he's doing, it doesn't sound like you've got much to lose by giving it a shot (ha ha, bad joke!).
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