A mistake can be made in interpretating plasma triglyceride levels sin
ce in some cases pseudohypertriglyceridaemia may result from increased
plasma glycerol due to a glycerol kinase deficit. Most automated trig
lyceride assays used in laboratories do not contain a negative control
, i.e. a glycerol assay. We report two cases with pseudohypertriglycer
idaemia due to hyperglycerolaemia and describe the clinical and biolog
ical features which suggested the diagnosis.