The diagnostic criterion for anemia is For men: Hemoglobin < 14 g / dL (140 g / L), hematocrit < 42% (< 0.42), or RBC < 4.5 million / mcL (< 4.5 × 10 12 / L) For women: Hemoglobin < 12 g / dL (120 g / l), hematocrit < 37% (< 0.37), or RBC < 4 million / mcL (< 4 × 10 12 / L) For infants and children, normal values vary with age, necessitating use of age-related tables (see table Age-Specific Values for Hemoglobin and Hematocrit).