In our countries, a good prescription of analysis would help to reduce hospital costs without modifying the efficiency of the diagnosis approach. In this work, the authors establish a bond between medicos and biologists by a good indication of protein check-up in the diagnosis and follow up of protein-energy malnutrition (PEM). After a discriminant analysis of all the results of protein check-up, two groups of markers are individualized depending on whether the PEM is accompanied or not by inflammatory complications. Finally, they recommend a systematic prescription of the useful group in case of inflammation associated with PEM, because infectious and parasitic diseases are almost constant among our malnourished infants.