| Summary: | Along with its uses in a wide range of sectors, NP toxicity research was one of the fastest-growing areas of research, so the growing commercial applications brought aluminum oxide nanoparticles under the purview of toxicologists. This study shows the toxicity of Aluminum oxide Nanoparticles on blood components prepared using the pulsed laser ablation (PLA) <em>Nd: YAG</em> laser method. We confirmed the synthesis of aluminum Oxide nanoparticles by measuring color absorbance, UV-vis, scanning electron microscope techniques (SEM), and FTIR as characterization of Aluminum oxide Nanoparticles. The complete blood count (CBC) was used in the study of the toxicity effect of these nanoparticles on human blood parameters <em>(in vitro</em>). The results of hematology parameter platelet (PLT); hemoglobin (HGB–Hb); red blood cell (RBCs); white blood cell (WBCs); Count type white blood cells) are compared with the control groups, our results show no significant differences in levels of platelet (PLT); hemoglobin (HGB –Hb); red blood cell (RBCs); white blood cell (WBCs); Count type white blood cells) between the test groups when compared with control groups. This result that there indicates no toxic effect of Aluminum oxide nanoparticles in the hematology parameter (<em>in vitro</em>). This work is done for the first time to investigate the non-toxicity effect of these Al<sub>2</sub>O<sub>3</sub> NPS on human blood parameters.
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