A detailed description is given of a rapid, simple and economic technique for the electrophoretic migration on agarose gel of serum lipoproteins. The albuminated agarose is spread hot on pieces of normal radiological plates even if already used. The reservoir for the serum is obtained by putting in the agarose while still hot a series of small metal bars. The moulds are removed with a small magnet as soon as the gel is formed. Plates prepared for 6-7 lipidograms can comfortably be kept for as long as 20-30 days. For stored plates ready for use, the analytic procedure does not require more than 40-45 minutes. The results can be considered altogether satisfactory.