Is there a way to convert mml to umol?

I am looking at the results of a relative's medical test and I'm wondering if there is a way to convert mml to umol? I would understand the meaning better if I could know what it was in umol, so I'm wondering if anyone has a conversion formula?
Update: It does not say. My test result long ago was in mml, and now hers is in umol. My test was done at a different laboratory than hers. I wanted to convert to get an idea of what her elevated ranges are. I do appreciate your help. We will try both ways you suggested and see if the ranges make any sense to us. Thank you.
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