A normal gap is 12 +/- 4 (i.e. 8 to 16).  The<unk>  is the difference between measured cations and measured anions in serum.  This difference does not  reflect a true disparity between positive and negative charges, given that serum actually 
is electrically neutral when all serum cations and anions are measured.  Rather, the<unk>  is a measurement artifact resulting 
from the fact that only certain cations and anions are routinely measured.<unk>  metabolic acidosis is secondary to the addition of endogenous or exogenous acid<unk>  = Na - (Cl  +  HCO3)
Normal<unk>  = 12+/-4 (8-16)
12-20 mEq/L when including K+
Cutoffs for "normal"<unk>  are laboratory and equipment specific.  Newer technology and equipment have been shown to measure "low"<unk>  in otherwise normal, healthy people.
Anion gap
Osmolal or Osmolar Gap
Anion Gap and Osmolar Gap 
Humate-P
Chlorine gas
Celsius Fahrenheit Temperature Conversion
Non anion gap acidosis
Dystonic reaction