The<unk>  is calculated using measured ions found in the<unk> . It is used to aid in the differential diagnosis of metabolic acidosis. The term<unk> <unk> " without qualification usually implies serum<unk> <unk> . The<unk> " is a different measure, principally used to determine whether the kidneys are capable of appropriately acidifying<unk> .
Urine anion gap
Urine osmolality
Osmol gap
Plasma osmolality
Serum chloride
Sucrose gap
Urine sodium
Blood urea nitrogen