[Biological examination in hyperlipemia].

The authors review the various methods of investigation useful in the classification of hyperlipoproteinaemias. Estimation of cholesterol and triglycerides remain the most important elements but do not suffice alone to reach a conclusion and measurement of phospholipids would seem to be a useful addition. Electrophoresis on agar, isolating a larger quantity of prebetalipoproteins, does not always facilitate classification. Finally, ultracentrifugation is often necessary in those forms which are difficult to classify, these representing almost 20 p.cent of patients.