Commonly if you show signs of IR you are a candidate for met, but lots of ladies with "normal" glucose labs are still put on met.
A study I read recently indicated that hyperandrogenemia and anovulation were the two criteria, and ladies had success (Those were my two primary complaints, so in my case, it would prove true). So if you have irregular or absent menses along with elevated male hormones or excess hair growth, you may well benefit from metformin therapy.
Here's the link: http://www.ivf.com/faqs/pcos3.html
All the best! 
__________________
Christy
33 yrs, 1 precious hubby, 2 miracle kids, At Goal Wt for 4 yrs, Trygly's down 445 pts, Free Androgen down from 20 to 2, 3 half 'thons ran, 2 mtns hiked, 1 crazy run in the Rockies, 4 forest trail races, profiled in 2 magazines...1 woman determined to kick PCOS butt!
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Before & Aug 2007
'08: Duathlon and another half? | 
What are bloodwork req.'s for MEt 
