To establish the hematological reference values in the healthy adults visited our hospitals, following examination were done on 2823 persons by Coulter Counter Model S-plus II ; white blood cell count (WBC), red blood cell count (RBC), hemoglobin (Hb), hematocrit (Hct), meant corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), red cell distribution width (RDW), platelet, plateletcrit, mean platelet volume (MPV) and platelet distribution width (PDW). The following results are obtained. 1) Male, mean value of WBC; 6,800±2,680 (2SD)/µl Female, mean value of WBC; 5,950±2,380 (2SD)/µl 2) Male, mean value of RBC; 428±60 (2SD)x104/µl Female, mean value of RBC; 415±56 (2SD)x104/µl 3) Male, mean value of Hb; 15.4±1.8 (2SD) g/dL Female, mean value of Hb; 13.0±1.6 (2SD) g/dL 4) Male, mean value of Hct; 45.3±5.0 (2SD)% Female, mean value of Hct; 38.2±4.6 (2SD)% 5) Male, mean value of MCV; 93.8±5.8 (2SD) fL Female, mean value of MCV; 92.2±7.4 (2SD) fL 6) Male, mean value of MCH; 31.8±2.2 (2SD) pg Female, mean value of MCH; 31.4±2.8 (2SD) pg 7) Male, mean value of MCHC; 34.0±1.2 (2SD)% Female, mean value of MCHC; 33.9±1.2 (2SD)% 8) Male, mean value of RDW; 12.7±1.0 (2SD)% Female, mean value of RDW; 12.6±1.4 (2SD)% 9) Male, mean value of Platelet; 242.9±87.8 (2SD) X103/µl Female, mean value of Platelet; 242.2±89.0 (2SD) X103/µl 10) Male, mean value of Plateletcrit; 0.201±0.076 (2SD)% Female, mean value of Plateletcrit; 0.204±0.076 (2SD)% 11) Male, mean value of MPV; 8.20±1.70 (2SD) fl Female, mean value of MPV; 8.36±1.82 (2SD) fl 12) Male, mean value of PDW; 16.1±0.8 (2SD)% Female, mean value of PDW; 16.0±0.8 (2SD)%