Figure 1From: A balanced view of balanced solutionsRepresentation of the Stewart model. Charge balance in blood plasma. Any difference between apparent strong ion difference (SIDa) and effective strong ion difference (SIDe) is the strong ion gap (SIG) and presents unmeasured anions. The SIG should not be confused with the anion gap (AG). A corrected AG can be calculated to account for variations in albumin concentration. Adapted from Stewart [6].Back to article page