What does a low annion gap reading from bloodwork mean???

I'm five months postop and down 90lbs. I just got my first bloodwork back and have found that while everything else is the same or a tad improved, my annion gap number has dropped from a 12 to an 8, which is just barely in the normal range. I want to be very sure to watch for downward trends, but I have no idea what annion gap does/relates to. Can anyone help me out?

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