Background and Aim: Hematologic values are extensively used for health evaluation. These values can be used for diagnosis and management of hematologic and nonhematologic diseases. Some factors affect these values, including age, sex, race, diet, and environment. Since these factors vary in various populations, they can cause differences in reference hematologic values. Materials and methods: In this study 1040 healthy individuals were randomly selected in various locations of Mashhad from different age groups: 11-13, 14-18, and 19-55 years. Standard specimens were collected. Analysis of WBC, RBC, Hb, Hct, RBC indices, PLT and leukocyte differential counts were performed and reference values were calculated. Results: Reference ranges for RBC, Hb and hemtocrit were higher in adult male participants. Platelet counts were higher in females. Hematologic reference values in adult males were: WBC (×103μl)= 6.45(3.3-9.6), RBC(×106μl )= 5.43±0.9, Hb (gr/dl)=15.9±1.96, Hct (%)= 47.2±7.2 , PLT(×103μl)=231(133-329). Conclusion: Determination of hematologic reference values in this study showed obvious differences with previous studies. In particular MCV, MCH, MCHC, WBC, and platelet counts were lower.

Keywords: Hematologic values; Normal values; Reference values; Complete blood count

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