content of total protein (pt), albumin (alb), globulins (glb), urea (u), uric acid (au), creatinine (ct) and transaminase levels (oxalacetic-glutamic (tgo) and piruvic-glutamic (tgp)) was evaluated in the blood plasm of golden hamster (mesocrisetus auratus l.), fed diets (crude protein; pb= 13.5-19.6%) with red worm (hl) (eisenia spp.) meal and two conventional feeds (conejarina？; pb= 11.4% and ratarina？; pb= 21.1%). the pt, alb, glb and ct concentration oscillated among 5-6, 2-3, 2-3 g/dl y 0,3-0,4 mg/dl, respectively, no significant differences among the treatments in the assay were observed (p>0.05). in the assay the u and au content fluctuated between 23-101 y 3-9 mg/dl, respectively; according to the pb level, hl inclusion and measurement time. the transaminase levels were high and variables during the second week of assay, according to the proteic level diets (tgo: 101-699 y tgp: 54-890 ui/ l). the seric pt, glb, alb and ct content were independent of pb diets and hl proportion, while the u (r2= 0.509*), tgo (r2= 0.661**) and tgp (r2= 0.524*) level were related with proteic level of diets, and the u (r2= 0.502*) and au (r2= 0.531*) contents with the hl inclusion. the hl addition in 24, 27 and 30% for making formulated proteic diets to m. auratus cause significant variation in the normal values of u, au and transaminases.