The influence of age on serum biochemical parameters (AST, GGT, urea, uric acid, urea/uric acid ratio, total proteins, albumin, globulins and A/G ratio) was investigated in juvenile turkeys. Statistical comparisons were made for differences in values among different ages, from 76-148 day-old turkeys. Significant variations were observed in the analyses in relation to age of the birds for urea, AST and total proteins. This study also aimed to determine serum biochemical values for turkeys. © Asian Network for Scientific Information, 2009.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)