The present diagnosis and control of dyslipoproteinemia require the analysis, not only of lipids, but also that of their carriers, the lipoproteins, as well as that of the enzymes necessary to their metabolism. Qualitative and quantitative techniques of analysis of lipoproteins have been described. Apolipoprotein quantitation methods have been brought to memory, calling attention to the specific problems related with these determinations, particularly in the case of immunological techniques. The clinical interest of these evaluations has been discussed and the various corresponding pathologies have been mentioned briefly.