Isolated elevated aspartate aminotransferase in an asymptomatic woman due to macro-aspartate aminotransferase: A case report

Table 2 Precipitation with polyethylene glycol

	AST origin	AST DIL1/2	AST PEG	PPA (%)	AST recovery (%)
Patient	71.8	38.9	1.4	96.4	3.60
Control 1	229	121.7	49.8	59.1	40.9
Control 2	68	31	17.7	42.9	57.1

Polyethylene glycol precipitation (PEG): 25% PEG centrifuged at 3000 rpm of two control serum samples and samples from the patient with macro-aspartate aminotransferase (AST). AST origin: AST value of the original serum; AST diluted 1/2 (DIL1/2): AST value of serum DIL1/2 with phosphate-buffered saline; AST PEG: AST value after PEG precipitation. PEG-precipitable activity (PPA) = 100 × [(AST DIL1/2−AST PEG)/AST DIL1/2]; AST recovery = 100 × (AST PEG/AST DIL1/2).