meaning of Anion gap

Anion gap meaning in Medical Dictionary

a dimension of this interval involving the sum of "routinely measured" cations minus the sum of the "routinely calculated" anions into the bloodstream. The anion gap = (Na+ + K+) - (Cl- + HCO3-) in which Na- is salt, K+ is potassium, Cl- is chloride, and HCO3- is bicarbonate.