Short-chain acyl-CoA dehydrogenase (SCAD) is the key enzyme for degrading fatty acids with a 4-6 atoms carbon chain. It is necessary to always confirm this deficiency using laboratory methods. Fibroblasts of patients suffering SCAD deficiency were incubated with tritiated palmitate and miristatesubstrates. A significant difference (p<0.05) was found when comparing tritiated palmitate and miristate degradation between controls and patients suffering SCAD deficiency.