Timing of Repeat Bloodwork After Starting Metformin

Eleanor Kellon, VMD

I suggest a week. If it's going to work (doesn't always) you will have peak effect by then. No point continuing it if it isn't having a satisfactory effect. Some have reported insulins going down over a longer time frame but it's more likely that was from other changes made, not the metformin.
Eleanor in PA

EC Owner 2001


Hi Kelly,
Here’s a link to a write up addressing the most frequently asked questions about metformin.  It suggests retesting 1 week after starting metformin.
Martha in Vermont
ECIR Group Primary Response
July 2012 
Logo (dec. 7/20/19), Tobit(EC) and Pumpkin, Handy and Silver (EC/IR)

Martha and Logo


Kelly Gilmartin

Hi all,
What is the suggested timeframe after starting metformin to have a repeat insulin run?
Kelly Gilmartin/Buddy
Western Massachusetts 
member since 2019
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