Bis albuminemia is a rare qualitative anomaly, it is hereditary or acquired and transient and physiopathology remains a little unknown. Indeed, the study presents 6 cases of bis albuminemias collected on 2083 serum protein electrophoresis carried out at the laboratory of biochemistry of CHU Ibn Rochd of Casablanca over a spread period of one year (2018). The results of electrophoresis serum proteins of 6 reported cases showed bis albuminemias which are all of acquired and transient type, of which 3 cases are related to the drug intake of betalactamine antibiotic and the other 3 are related to the syndrome nephrotic.