Objectives: The purpose of this study is to determine the normal hematological values and those of some biochemical parameters of the students of the city of Gagnoa (Côte d’Ivoire). Design et Methods: The study was conducted in 184 adolescents (94 girls and 90 boys), aged 11 to 18 years old, recruited in moderne high schools of Gagnoa. The hematological values were determined using an automatic analyzer (Sysmex XP3000, France). The concentrations of biochemical parameters (albumin, protein total, cholesterol total, triglycerides, calcium, magnesium, chloride, potassium and sodium) were determined by spectrophotometer (KENZA MAX BioChemis Try, France) on the venous blood samples were taken from the fold of the elbow with an empty stomach. The results were treated with the statistical analysis software XLSTAT-PRO 7.1. 2018. Results: The median values of red blood cells were 4.5,106/µL (girls) and 4.9,106/µL (boys). The median values of hemoglobin in girls was 12.3 g/dL and among boys was 13 g/dL. The median values of hematocrit girls was 35.9 % and boys was 38 %. The median values MCV were 79.3 fL (girls) and 77 fL (boys). The median values of MCH were 27.6 pg/cell among girls and 26.9 pg/cell among boys. The median values of MCHC girls 34.5 g/dL and boys 34.8 g/dL. The médians values of white blood cells were 6.1.103/µL among girls and 5.8.103/µL among boys. The median values of granulocyte were 2.2,103/µL among girls and 2.4, 103/µL among bboys. The median values of lymphocytes among girls and boys were the same (3,103/µL). The median values of monocyte were 0.7, 103/µL among girls and 0.6 103/µL in boys. The median values of platelet among girls and boys were equal to 247,103/µL and 242,103/µL. The median valeues of protein total among girls and boys were 68 g/L and 69 g/L. The median values of albumin were respectively 47 g/L and 45.7 g/L among girls and boys. The median values of cholesterol total in girls and boys were the same (1.3 g/L). The median values .....